It’s almost 30C in here, and humid as all hell. I just dumped a ton of heat and 50L of water in to the air.
During this process, the poor Hab had to be the mother of a messy toddler. It’s been replacing the oxygen I’ve used, and the Water Reclaimer is trying to get the humidity down to sane levels. Nothing to be done about the heat. There’s actually no air-conditioning in the Hab. Mars is cold. Getting rid of excess heat isn’t something we expected to deal with.
I’ve now grown accustomed to the alarms that are blaring at all times. The fire alarm has finally stopped, now that there’s no more fire. The low oxygen alarm should stop soon. The high humidity alarm will take a little longer. The Water Reclaimer has its work cut out for it today.
For a moment, there yet another alarm. The Water Reclaimer’s main tank was full. Booyah! That’s the kind of problem I want to have!
Remember the spacesuit I vandalized yesterday? I hung it on its rack and carried buckets of water to it from the reclaimer. It can hold an atmosphere of air in. It should be able to handle a few buckets of water.
Man I’m tired. Been up all night and it’s time to sleep. But I’ll drift off to dreamland in the best mood I’ve been in since Sol 6.
Things are finally going my way. In fact, they’re going great! I have a chance to live after all!
I am fucked and I’m gonna die!
Ok, calm down. I’m sure I can get around this.
I’m writing this log to you, dear future Mars archeologist, from Rover 2. You may wonder why I’m not in the Hab right now. Because I fled in terror, that’s why! And I’m not sure what the hell to do next.
I guess I should explain what happened. If this is my last entry, you’ll at least know why.
Over the past few days, I’ve been happily making water. It’s been going swimmingly. (See what I did there? “swimmingly”)
I even beefed up the MAV fuel plant compressor. It was very technical (I increased the voltage to the pump). So I’m making water even faster now.
After my initial burst of 50L, I decided to settle down and just make it at the rate I get O2. I’m not willing to go below a 25L reserve. So when I dip too low, I stop dicking with Hydrazine until I get the O2 back up to well above 25L.
Important note: When I say I made 50L of water, that was an assumption. I didn’t reclaim 50L of water. The additional soil I’d filled the Hab with was extremely dry and greedily sucked up a lot of the humidity. That’s where I want the water to go anyway, so I’m not worried, and I wasn’t surprised when the reclaimer didn’t get anywhere near 50L.
I get 10L of CO2 every 15 hours now that I souped up the pump. I’ve done this process four times. My math tells me that, including my initial 50L burst, I should have 130L of water added to the system.
Well my math is a damn liar!
I’ve gained 70L in the water regulator and the spacesuit-now-watertank. There’s plenty of condensation on the walls and domed roof, and the soil is certainly absorbing its fair share. But that doesn’t account for 60L of missing water. Something was wrong.
That’s when I noticed the other O2 tank.
The Hab has two reserve O2 tanks. One on each side of the structure, for safety reasons. The Hab can decide which one to use whenever it wants. Turns out it’s been topping off the atmosphere from Tank 1. But when I add O2 to the system (via the Oxygenator), the Hab evenly distributes the gain among the two tanks. Tank 2 has been slowly gaining oxygen.
That’s not a problem, it’s just doing its job. But it does mean I’ve been gaining O2 over time. Which means I’m not consuming it as fast as I thought.
At first, I thought “Yay! More oxygen! Now I can make water faster!” But then a more disturbing thought occurred to me.
Follow my logic: I’m gaining O2. But the amount I’m bringing in from outside is constant. So the only way to “gain” it is to be using less than I thought. But I’ve been doing the Hydrazine reaction with the assumption that I was using all of it.
The only possible explanation is I haven’t been burning all the released hydrogen.
It’s obvious now, in retrospect. But it never occurred to me that some of the hydrogen just wouldn’t burn. It got past the flame, and went on its merry way. Dammit, Jim, I’m a botanist, not a chemist!
Chemistry is messy, so there’s unburned Hydrogen in the air. All around me. Mixed in with the oxygen. Just… hanging out. Waiting for a spark so it can
Once I figured this out, and composed myself, I got a Ziploc-sized sample bag and waved it around a bit, then sealed it.
Then, a quick EVA to a rover, where we keep the atmospheric analyzers. Nitrogen: 22%. Oxygen: 9%. Hydrogen: 64%.
I’ve been hiding here in the rover ever since.
It’s Hydrogenville in the Hab.
I’m very lucky it hasn’t blown. Even a small static discharge would have led to “Oh the humanity!”
So, I’m here in Rover 2. I can stay for a day or two, tops, before the CO2 filters from the rover and my spacesuit fill up. I have that long to figure out how to deal with this.
The Hab is now a bomb.
Chapter 5
I’m still cowering in the rover, but I’ve had time to think. And I know how to deal with the hydrogen.
I thought about the Atmospheric Regulator. It pays attention to what’s in the air and balances it. That’s how the excess O2 I’ve been importing ends up in the tanks. Problem is, it’s just not built to pull hydrogen out of the air.
The regulator uses freeze-separation to sort out the gasses. When it decides there’s too much oxygen, it starts collecting air in a tank and cooling it to 90 kelvin. That makes the oxygen turn to liquid, but leaves the nitrogen (condensation point: 77K) still gaseous. Then it stores the O2.
But I can’t get it to do that for hydrogen, because hydrogen needs to be below 21K to turn liquid. And the regulator just can’t get temperatures that low. Dead end.
Here’s the solution:
Hydrogen is dangerous because it can blow up. But it can only blow up if there’s oxygen around. Hydrogen without oxygen is harmless. And the regulator is all about pulling oxygen out of the air.
There are four different safety interlocks that prevent the regulator from letting the Hab’s oxygen content get too low. But they’re designed to work against technical faults, not deliberate sabotage (bwa ha ha!).
Long story short, I can trick the regulator in to pulling all the oxygen out of the Hab. Then I can wear a spacesuit (so I can breathe) and do whatever I want without fear of blowing up. Yay!
I’ll use an O2 tank to spray short bursts of oxygen at the hydrogen, and make a spark with a couple of wires and a battery. It’ll set the hydrogen on fire, but only until the small bit of oxygen is used up.
I’ll just do that over and over, in controlled bursts, until I’ve burned off all the hydrogen.
One tiny flaw with that plan: It’ll kill my dirt.
The dirt is only viable soil because of the bacteria growing in it. If I get rid of all the oxygen, the bacteria will die. I don’t have 100 billion little spacesuits handy.
It’s half a solution anyway.
Time to take a break from thinking.
Commander Lewis was the last one to use this rover. She was scheduled to use it again on Sol 7, but she went home instead. Her personal travel kit’s still in the back. Rifling through it, I found a protein bar and a personal USB, probably full of music to listen to on the drive.
