فصل 21کتاب: مریخی / فصل 21
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LOG ENTRY: SOL 431
I’m working out how to pack. It’s harder than it sounds.
I have two pressure vessels: The rover and the trailer. They’re connected by hoses, but they’re also not stupid. If one loses pressure,
the other wil instantly seal off the shared lines.
There’s a grim logic to this: If the rover breaches I’m dead. No point in planning around that. But if the trailer breaches, I’l be fine. That means I should put everything important in the rover. If I’m going to die, I may as wel take al the delicate stuff with me.
Everything that goes in the trailer has to be comfortable in near-vacuum and freezing temperatures. Not that I anticipate that, but you
know. Plan for the worst.
There isn’t much room to spare. It’l have two bulky Hab batteries, the Atmospheric Regulator, the Oxygenator and my home-made
heat reservoir. It would be more convenient to have the reservoir in the rover, but it has to be near the Regulator’s return air feed.
It’l be cramped, but there wil be some empty spaces. And I know just how to fil them: Taters!
Nothing “bad” can happen to the potatoes. They’re already dead. I’ve been storing them outside for months anyway. Also, they’re smal
and not delicate. They probably won’t al fit, so some wil have to ride with me.
The rover wil be pretty packed, too. When I’m driving, I’l keep the bedroom folded up near the airlock, ready for emergency egress.
Also, I’l have the two functional EVA suits in there with me and anything that might be needed for emergency repairs: Tool kits, spare
parts, my nearly depleted supply of sealant, the other rover’s main computer (just in case!) and al 620 glorious liters of water.
And a plastic box to to serve as a toilet. One with a good lid.
“How’s Watney doing?” Venkat asked.
Mindy looked up from her computer with a start. “Dr. Kapoor?”
“I hear you caught a pic of him during an EVA?”
“Uh, yeah,” Mindy said, typing on her keyboard. “I noticed things would always change around 9am local time. People usualy keep
the same patterns so I figured he likes to start work around then. I did some minor realignment to get seventeen pics between 9:00 and
9:10. He showed up in one of them.”
“Good thinking. Can I see the pic?”
“Sure,” she said. She brought up the image on her screen.
Venkat peered at the blurry image. “Is this as good as it gets?”
“Wel it is a photo taken from orbit,” Mindy said. “The NSA enhanced the image with the best software they have.”
“Wait, What?” Venkat stammered. “The NSA?”
“Yeah, they caled and offered to help out. Same software they use for enhancing spy satelite imagery.”
Venkat shrugged. “It’s amazing how much red tape gets cut when everyone’s rooting for one man to survive.” He pointed to the screen.
“What’s Watney doing here?”
“I think he’s loading something into the rover.”
“When was the last time he worked on the trailer?” Venkat asked.
“Not for a while. Why doesn’t he write us notes more often?”
Venkat shrugged. “He’s busy. He works most of the daylight hours, and arranging rocks to spel a message takes time and energy.”
“So…” Mindy said. “Why’d you come here in person? We could have done al this over email.”
“Actualy, I came to talk to you,” he said. “There’s going to be a change in your responsibilities. From now on, instead of managing the
satelites around Mars, your sole responsibility is watching Mark Watney.”
“What?” Mindy said. “What about course corrections and alignment?”
“We’l assign that to other people,” Venkat said. “From now on, your only focus is examining imagery of Ares 3.”
“That’s a demotion,” Mindy said. “I’m an orbital engineer, and you’re turning me in to a glorified Peeping Tom.”
“It’s short-term,” Venkat said. “And we’l make it up to you. Thing is, you’ve been doing it for months and you’re an expert at
identifying elements of Ares 3 from satelite pics. We don’t have anyone else who can do that.”
“Why is this suddenly so important?”
“He’s running out of time,” Venkat said. “We don’t know how far along he is on the rover modifications. But we do know he’s on only
got 16 sols to get them done. We need to know exactly what he’s doing. I’ve got media outlets and senators asking for his status al the
time. The President even caled me a couple of times.
“But seeing his status doesn’t help,” Mindy said. “It’s not like we can do anything about it if he fals behind. This is a pointless task.”
“How long have you worked for the government?” Venkat sighed.
LOG ENTRY: SOL 434
The time has come to test this sh@t out.
This presents a problem. Unlike my Pathfinder trip, I have to take vital life support elements out of the Hab. When you take the
Atmospheric Regulator and Oxygenator out of the Hab, you’re left with… a tent. A big round tent that can’t support life.
It’s not as risky as it seems. As always, the dangerous part about life support is managing carbon dioxide. When the air gets to 1%
CO2, you start getting symptoms of poisoning. So I need to keep it below that.
The Hab’s internal volume is about 120,000L. Breathing normaly, it would take me over two days to bring the CO2 level up to 1%
(and I wouldn’t even dent in the O2 level). So it’s safe to move the Regulator and Oxygenator over for a while.
Both are way too big to fit through the trailer airlock. Lucky for me, they came to Mars with “some assembly required”. They were too
big to send whole, so they’re easy to dismantle.
Over several trips, I took al their chunks to the trailer. I brought each chunk in through the airlock, one at a time. It was a pain in the ass reassembling them inside, let me tel you. There’s barely enough room for al the sh@t it’s got to hold. There wasn’t much left for our intrepid hero.
Then I got the AREC. It sat outside the Hab like an AC unit might on Earth. In a way, that’s what it was. I hauled it over to the trailer and lashed it to the shelf I’d made for it. Then I hooked it up to the feed lines that led through the “baloon” to the inside of the trailer’s pressure vessel.
The Regulator needs to send air to the AREC then the return air needs to bubble through the heat reservoir. And, it needs a pressure
tank to dump the CO2 it puls from the air.
When gutting the trailer to make room, I left one tank in place for this. It’s supposed to hold oxygen, but a tank’s a tank. Thank God al the air lines and valves are standardized across the mission. That’s no mistake. It’s a deliberate decision for maintenance purposes. We could fix things in the field easier that way.
Once everything assembled, I hooked them in to the trailer’s power and watched them power up. I ran both through ful diagnostics to
confirm they were working correctly. Then I shut down the Oxygenator. Remember, I’l only use it one sol out of every 5.
I moved to the rover, which means I had to do an annoying 10-meter EVA. From there I monitored the life support situation. It’s worth
noting that I can’t monitor the actual support equipment from the rover (it’s al in the trailer), but the rover can tel me al about the air.
Oxygen, CO2, temperature, humidity, etc. Everything seemed ok.
Getting back in to the EVA suit, I released a canister of CO2 in to the rover’s air. I watched the rover computer have a sh@t-fit when it saw the CO2 spike to lethal levels. Then, over time, the levels dropped to normal. The regulator was doing its job. Good boy!
I left the equipment running when I returned to the Hab. It’l be on its own al night and I’l check it in the morning. It’s not a true test, because I’m not there to breathe up the oxygen and make CO2, but one step at a time.
LOG ENTRY: SOL 435
Last night was weird. I knew logically that nothing bad would happen in just one night, but it was a little unnerving to know I had no life support other than heaters. My life depended on some math I did earlier. If I dropped a sign or added two numbers wrong, I might
never wake up.
But I did wake up, and the main computer showed the slight rise in CO2 I had predicted. Looks like I live another Sol.
“Live Another Sol” would be an awesome name for a James Bond movie.
I checked up on the rover. Everything was fine. If I don’t drive it, a single charge of the batteries could keep the regulator going for over a month (with the heater off). It’s a pretty good safety margin to have. If al hel breaks loose on my trip I’l have time to fix things. I’d be limited by oxygen consumption rather than CO2 removal, and I have plenty of oxygen.
I decided it was a good time to test the bedroom.
I got in the rover, and attached the bedroom to the outer airlock door from the inside. Like I mentioned before, this is the only way to do it. Then I turned it loose on an unsuspecting Mars.
As intended, the pressure from the rover blasted the canvas outward and inflated it. After that, chaos. The sudden pressure popped the
bedroom like a baloon. It quickly deflated, leaving both itself and the rover devoid of air. I was wearing my EVA suit at the time; I’m not a fu@king idiot. So I get to…
Live Another Sol! (Starring Mark Watney as … probably Q. I’m no James Bond.)
I dragged the popped bedroom in to the Hab and gave it a good going-over. It failed at the seam where the wal met the ceiling. Makes
sense. It’s a right-angle in a pressure vessel. Physics hates that sort of thing.
First, I patched it up, then I cut strips of spare canvas to place over the seam. Now it has double-thickness and double sealing resin al around. Maybe that’l be enough. At this point, I’m kind of guessing. My amazing botany skils aren’t much use for this.
I’l test it again tomorrow.
LOG ENTRY: SOL 436
I’m out of caffeine pils. No more Martian Coffee for me.
So it took a little longer for me to wake up this morning, and I spent most of the day with a headache. One nice thing about living in a multi-bilion dolar mansion on Mars: Access to pure oxygen. For some reason, a high concentration of O2 wil kil most headaches. Don’t
know why. Don’t care. The important thing is I don’t have to suffer.
I tested out the bedroom again. I used the same process as yesterday. This time it held. So is that good? I don’t know. That’s the sh@tty part of failure analysis. If the bedroom fails while I’m sleeping in it, I’l die. How long wil it last?
Hopefuly, if it developed a leak, it’d be slow enough that I could react. But you never know.
After a few minutes standing around in my EVA suit, I decided to make better use of my time. I may not be able to leave while the
bedroom is attached to the airlock, but I can go in to the rover and close the door.
Once I did that, I took off the uncomfortable EVA suit. The bedroom was on the other side of the airlock door, stil fuly pressurized.
So I’m stil running my test, but I don’t have to wear the EVA suit.
I wanted a good long test (I arbitrarily picked 8 hours) so I was trapped in the rover until then.
I spent my time planning the trip. There wasn’t much to add to what I already knew. I’l bee-line to Mawrth Valis, then folow it until it ends. It’l take me on a zig-zag route, but mostly toward Schiapareli.
After that comes Arabia Terra. Each crater represents two brutal elevation changes. First down, then up. I did my best to find the
shortest path around them. I’m sure I’l have to adjust the course when I’m actualy driving it. No plan survives first contact with the enemy.
Mitch took his seat in the conference room. The usual gang was there: Teddy, Venkat, Mitch, and Annie. But this time there was also
Mindy Park as wel as a man Mitch had never seen before.
“What’s up, Venk?” Mitch asked. “Why the sudden meeting?”
“We’ve got some developments,” Venkat said. “Mindy, why don’t you bring them up to date.”
“Uh, yeah,” Mindy said. “Looks like Watney finished the baloon addition to the trailer. It mostly uses the design we sent him.”
“Any idea how stable it is?” Teddy asked.
“Pretty stable,” she said. “It’s been inflated for several days with no problems. Also he built some kind of… room.”
“Room?” Teddy asked.
“It’s made of Hab canvas, I think,” Mindy explained. “It attaches to the rover’s airlock. I think he cut a section out of the Hab to make it. I don’t know what it’s for.”
Teddy turned to Venkat. “Why would he do that?”
“We think it’s a workshop,” Venkat said. “There’l be a lot of work to do on the MAV once he gets to Schiapareli. It’l be easier
without an EVA suit. He probably plans to do as much as he can in that room.”
“Clever,” Teddy said.
“Watney’s a clever guy,” Mitch said. “How about getting life support in there?”
“I think he’s done it,” Mindy said. “He moved the AREC.”
“Sorry,” Annie interrupted. “What’s an AREC?”
“It’s the external component of the Atmospheric Regulator,” Mindy said. “It sits outside the Hab, so I know when it disappeared. He
probably mounted it on the rover. There’s no other reason to move it so I’m guessing he’s got life support online.”
“Awesome,” Mitch said. “Things are coming together.”
“Don’t celebrate yet, Mitch,” Venkat said. “This is Randal Carter, one of our Martian meteorologists. Randal, tel them what you told
Randal nodded. “Thank you, Dr. Kapoor.” He turned his laptop around to show a map of Mars. “Over the past few weeks, a dust
storm has been developing in Arabia Terra. Not a big deal in terms of magnitude. It won’t hinder his driving at al.”
“So what’s the problem?” Annie asked.
“It’s a low-velocity dust storm,” Randal Explained. “Slow winds, but fast enough to pick up very smal particles on the surface and
whip them up in to thick clouds. There are five or six of them every year. The thing is, they last for months, they cover huge sections of the planet, and they make the atmosphere thick with dust.”
“I stil don’t see the problem,” Annie said.
“Light,” Randal said. “The total sunlight reaching the surface is very low in the area of the storm. Right now, it’s 20% of normal. And
Watney’s rover is powered by solar panels.”
“sh@t,” Mitch said, rubbing his eyes. “And we can’t warn him.”
“So he gets less power.” Annie said. “Can’t he just recharge longer?”
“The current plan already has him recharging al day long,” Venkat explained. “With 20% of normal daylight, it’l take five times as long
to get the same energy. It’l turn his 45 sol trip in to 225 sols. He’l miss the Hermes flyby.”
“Can’t Hermes wait for him?” Annie asked.
“It’s a flyby,” Venkat said. “Hermes isn’t going in to Martian orbit. If they did, they wouldn’t be able to get back. They need their
velocity for the return trajectory.”
After a few moments of silence, Teddy said “We’l just have to hope he finds a way through. We can track his progress and-”
“No we can’t,” Mindy interrupted.
“We can’t?” Teddy said.
She shook her head. “The satelites won’t be able to see through the dust. Once he enters the affected area, we won’t see anything until
he comes out the other side.”
“Wel…” Teddy said. “sh@t.”
LOG ENTRY: SOL 439
Before I risk my life with this contraption, I need to test it.
And not the little tests I’ve been doing so far. Sure, I’ve tested power generation, life support, the trailer bubble, and the bedroom. But I need to test al aspects of it working together.
I’m going to load it up for the long trip, and drive in circles. I won’t ever be more than 500 meters from the Hab, so I’l be fine if sh@t breaks.
I dedicated today to loading up the rover and trailer for the test. I want the weight to match what it’l be on the real trip. Plus if cargo is going to shift around or break things I want to know about it now.
I made one concession to common sense: I left most of my water supply in the Hab. I loaded 20 liters; enough for the test but no more.
There are a lot of ways I could lose pressure in this mechanical abomination I’ve created, and I don’t want al my water to boil off if that happens.
On the real trip, I’m going to have 620L of water. I made up the weight difference by loading 600kg of rocks in with my other supplies.
Back on Earth, universities and governments are wiling to pay milions to get their hands on Mars rocks. I’m using them as balast.
I’m doing one more little test tonight. I made sure the batteries were good and ful, then disconnected the rover and trailer from Hab
power. I’l be sleeping in the Hab, but I left the rover’s life support on. It’l maintain the air overnight, and tomorrow I’l see how much power it ate up. I’ve watched the power consumption while it’s attached to the Hab and there weren’t any surprises. But this’l be the true proof. I cal it the “Plugs-out test.”
Maybe that’s not the best name.
The crew of Hermes gathered in The Rec.
“Let’s get through status quickly,” Lewis said. “We’re al behind in our science assignments. Vogel, you first.”
“I repaired the bad cable on VASIMR 4,” Vogel reported. “It was our last thick gauge cable. If another such problem occurs, we wil
have to braid lower gauge lines to carry the current. Also, the power output from the reactor is declining.”
“Johanssen,” Lewis said. “What the deal with the reactor?”
“I had to dial it back,” Johanssen said. “It’s the cooling vanes. They aren’t radiating heat as wel as they used to. They’re tarnishing.”
“How can that happen?” Lewis asked. “They’re outside the craft. There’s nothing for them to react with.”
“I think they picked up dust or smal air leaks from Hermes itself. One way or another, they’re definitely tarnishing. The tarnish is
connecting the micro-lattice, and that reduces the surface area. Less surface area means less heat dissipation. So I limited the reactor enough that we weren’t getting positive heat.”
“Any chance of repairing the cooling vanes?”
“It’s on the microscopic scale,” Johanssen said. “We’d need a lab. Usualy they replace the veins after each mission.”
“Wil we be able to maintain engine power for the rest of the mission?”
“Yes, if the rate of tarnishing doesn’t increase.”
“Al right, keep an eye on it. Beck, how’s life support?”
“Limping,” Beck said. “We’ve been in space way longer than it was designed to handle. There are a bunch of filters that would normaly
be replaced each mission. I found a way to clean them with a chemical bath I made in the lab, but it eats away at the filters themselves.
We’re ok right now, but who knows what’l break next?”
“We knew this would happen,” Lewis said. “This ship is designed for a 396 day mission, and we need to make it last 898. We’ve got
al of NASA to help when things break. We just need to stay on top of maintenance. Martinez, what’s the deal with your bunkroom?”
Martinez furrowed his brow. “It’s stil trying to cook me. The climate control just isn’t keeping up. I think it’s the tubing in the wals that brings the coolant. I can’t get at them because they’re built in to the hul. We can use the room for storage of non-temperature-sensitive cargo, but that’s about it.”
“Where have you been sleeping?”
“In Airlock 2. It’s the only place I can be without people tripping over me.”
“No good,” Lewis said, shaking her head. “If one seal breaks, you die.”
“I can’t think of anywhere else to sleep,” he said. “The ship is pretty cramped, and if I sleep in a halway I’l be in people’s way.”
“Ok, from now on, sleep in Beck’s room. Beck can sleep with Johanssen.”
Johanssen blushed and looked down awkwardly.
“So…” Beck said, “You know about that?”
“You thought I didn’t?” Lewis said. “It’s a smal ship.”
“You’re not mad?”
“If it were a normal mission, I would be,” Lewis said. “But we’re way off-script now. Just keep it from interfering with your duties and I’m happy.”
“Milion-mile-high club,” Martinez said. “Nice!”
Johanssen blushed deeper and buried her face in her hands.
LOG ENTRY: SOL 444
I’m getting pretty good at this. Maybe when al this is over I could be a product-tester for Mars rovers.
Things went wel. I spent five sols driving in circles; I averaged 93 km per sol. That’s a little better than I’d expected. The terrain here is flat and smooth, so it’s pretty much a best-case scenario. Once I’m going up hils and around boulders it won’t be nearly that good.
The bedroom is awesome. Large, spacious, and comfortable. On the first night, I ran in to a little problem with the temperature. It was
fu@king cold. The rover and trailer regulate their own temperatures just fine, but things weren’t hot enough in the bedroom.
Story of my life.
The rover has an electric heater that pushes air with a smal fan. I don’t use it for anything because the RTG provides al the heat I need.
I liberated the fan and wired it in to a power line near the airlock. Once it had power al I had to do was point it at the bedroom.
It’s a low-tech solution, but it worked. There’s plenty of heat, thanks to the RTG. I just needed to get it evenly spread out. For once, entropy was on my side.
I fel in to a routine pretty quickly. In fact, it was hauntingly familiar. I did it for 22 miserable days on the Pathfinder trip. But this time, I had the bedroom and that makes al the difference. Instead of being cooped up in the rover, I have my own little Hab.
The procedure is what you’d expect. After waking up, I have a potato for breakfast. Then, I deflate the bedroom from the inside. It’s
kind of tricky, but I worked out how.
First, I put on an EVA suit. Then I close the inner airlock door, leaving the outer door (which the bedroom is attached to) open. This
isolates the bedroom, with me in it, from the rest of the rover. Then I tel the airlock to depressurize. It thinks it’s just pumping the air out of a smal area, but it’s actualy deflating the whole bedroom.
Once the pressure is gone, I pul the canvas in and fold it. Then I detach it from the outer hatch and close the outer door. This is the
most cramped part. I have to share the airlock with the entire folded up bedroom while it repressurizes. Once I have pressure again, I open the inner door and more-or-less fal in to the rover. Then I stow the bedroom, and go back to the airlock for a normal egress to Mars.
It’s a complicated process, but it detaches the bedroom without having to depressurize the rover cabin. Remember, the rover has al my
stuff that doesn’t play wel with vacuum.
The next step is to gather up the solar cels I’d laid out the day before and stow them on the rover and trailer. Then I do a quick check on the trailer. I go in through its airlock and basicaly take a quick look at al the equipment. I don’t even take off my EVA suit. I just want to make sure nothing’s obviously wrong.
Then, back to the rover. Once inside, I take off the EVA suit and start driving. I drive for almost 4 hours, and then I’m out of power.
Once I park, it’s back in to the EVA suit for me, and out to Mars again. I lay the solar panels out and get the batteries charging.
Then I set up the bedroom. Pretty much the reverse of the sequence I use to stow it. Ultimately it’s the airlock that inflates it. In a way, the bedroom is just an extension of the airlock.
Even though it’s possible, I don’t rapid-inflate the bedroom. I did that to test it because I wanted to find where it’l leak. But it’s not a good idea. Rapid inflation puts a lot of shock and pressure on it. It would eventualy rupture. I didn’t enjoy that time the Hab launched me like a cannonbal. I’m not eager to repeat it.
Once the bedroom is set up again, I can take off my EVA suit and relax the rest of the day. I mostly watch crappy 70’s TV. I’m
indistinguishable from an unemployed guy for most of the day.
I folowed that process for four sols, and then it was time for an “Air Day”.
An Air Day turns out to be pretty much the same as any other day, but without the 4 hour drive. Once I set up the solar panels, I fired
up the Oxygenator and let it work through the backlog of CO2 the Regulator had stored up.
Once it was done, my test run was complete. It converted al the CO2 to oxygen, and used up the day’s power generation to do it.
The test was a success. I’l be ready on time.
LOG ENTRY: SOL 449
Today’s the big day. I’m leaving for Schiapareli.
The rover and trailer are al packed. They’ve been mostly packed since the test run. But now I even have the water aboard.
I spent the last several days running ful diagnostics on everything. The Regulator, Oxygenator, RTG, AREC, batteries, rover life
support (in case I need a backup), solar cels, rover computer, airlocks, and everything else with a moving part or electronic component. I even checked each of the motors. Eight in al, one for each wheel, four on the rover, four on the trailer. The trailer’s motors won’t be
powered, but it’s nice to have backups.
It’s al good to go. No problems that I can see.
The Hab is a shel of its former self. I’ve robbed it of al critical components and a big chunk of its canvas. I’ve looted that poor Hab for everything it could give me, and in return it’s kept me alive for a year and a half. It’s like The Giving Tree.
I performed the final shutdown today. The heaters, lighting, main computer, etc. Al the components I didn’t steal for the trip to
I could have left them on. It’s not like anyone would care. But the original procedure for Sol 31 (which was supposed to be the last day of the surface mission) was to completely shut down the Hab and deflate it. NASA didn’t want a big tent ful of combustible oxygen next to the MAV when it launched, so they added the shutdown process to the mission.
I guess I did it as an homage to the mission Ares 3 could have been. A smal piece of the Sol 31 I never got to have.
Once I shut everything down, an eerie silence was al that remained. I’ve spent 449 sols listening to the heaters, vents, and fans. But
now it was dead quiet. It’s a creepy, eerie kind of quiet that’s hard to describe. I’ve been away from the Hab before, but always in the rover or an EVA suit. There’s always some kind of machinery in operation.
But now there was nothing. I never realized how utterly silent Mars is. It’s a desert world with practicaly no atmosphere to convey
sound. I could hear my own heartbeat.
Anyway, enough waxing philosophical.
I’m in the rover right now. (That should be obvious, with the Hab main computer offline forever.) I’ve got 2 ful batteries, al systems are go and I’ve got 45 sols of driving ahead of me.
Schiapareli or bust!
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