The Martian

Several staged sets of chutes deployed automatically to slow our descent, then Martinez manually piloted us to the ground, using the thrusters to slow descent and control our lateral motion. He’d trained for this for years, and he did his job extraordinarily well. He exceeded all plausible expectations of landings, putting us just nine meters from the target. The guy just plain owned that landing.

Thanks, Martinez! You may have saved my life!

Not because of the perfect landing, but because he left so much fuel behind. Hundreds of liters of unused hydrazine. Each molecule of hydrazine has four hydrogen atoms in it. So each liter of hydrazine has enough hydrogen for two liters of water.

I did a little EVA today to check. The MDV has 292L of juice left in the tanks. Enough to make a almost 600L of water! Way more than I need!

There’s just one catch: Liberating hydrogen from hydrazine is… well… it’s how rockets work. It’s really, really hot. And dangerous. If I do it in an oxygen atmosphere, the heat and newly liberated hydrogen will explode. There’ll be a lot of H₂O at the end, but I’ll be too dead to appreciate it.

At its root, hydrazine is pretty simple. The Germans used it as far back as World War II for rocket-assisted fighter fuel (and occasionally blew themselves up with it).

All you have to do is run it over a catalyst (which I can extract from the MDV engine) and it will turn in to nitrogen and hydrogen. I’ll spare you the chemistry, but the end result is that 5 molecules of hydrazine becomes 5 molecules of harmless N₂ and 10 molecules of lovely H₂. During this process, it goes through an intermediate step of being ammonia. Chemistry, being the sloppy bitch it is, ensures there’ll be some ammonia that doesn’t react with the hydrazine, so it’ll just stay ammonia. You like the smell of ammonia? Well it’ll be prevalent in my increasingly hellish existence.

The chemistry is on my side. The question now is how do I actually make this reaction happen slowly and how do I collect the hydrogen? The answer is: I don’t know.

I suppose I’ll think of something. Or die.

Anyway, much more important: I simply can’t abide the replacement of Chrissie with Cindy. “Three’s Company” may never be the same after this fiasco. Time will tell.

Chapter 4

LOG ENTRY: SOL 32

So I ran in to a bunch of problems with my water plan.

My idea is to make 600L of water (limited by the hydrogen I can get from the hydrazine). That means I’ll need 300L of liquid O₂.

I can create the O₂ easily enough. It takes 20 hours for the MAV fuel plant to fill its 10L tank with CO₂. The Oxygenator can turn it in to O₂, then the Atmospheric Regulator will see the O₂ content in the Hab is high, and pull it out of the air, storing it in the main O₂ tanks. They’d fill up, so I’d have to transfer O₂ over to the rovers’ tanks and even space suit tanks as necessary.

But I can’t create it very quickly. At 1/2L of CO₂ per hour, it will take 25 days to make the oxygen I need. That’s longer than I’d like.

Also, there’s the problem of storing the hydrogen. The air tanks of the Hab, the rovers, and all the space suits add up to exactly 374L of storage. To hold all the materials for water, I would need a whopping 900L of storage.

I considered using one of the rovers as a “tank”. It would certainly be big enough, but it just isn’t designed to hold in that much pressure. It’s made to hold (you guessed it) one atmosphere. I need vessels that can hold 50 times that much. I’m sure a rover would burst.

The best way to store the ingredients of water is to make them be water. So what’s what I’ll have to do.

The concept is simple, but the execution will be incredibly dangerous.

Every 20 hours, I’ll have 10L of CO₂ thanks to the MAV fuel plant. I’ll vent it in to the Hab via the highly scientific method of detaching the tank from the MAV landing struts, bringing it in to the Hab, then opening the valve until it’s empty.

The Oxygenator will turn it in to oxygen in its own time.

Then, I’ll release hydrazine, VERY SLOWLY, over the iridium catalyst, to turn it in to N₂ and H₂. I’ll direct the hydrogen to a small area and burn it.

As you can see, this plan provides many opportunities for me to die in a fiery explosion.

Firstly, hydrazine is some serious death. If I make any mistakes, there’ll be nothing left but the “Mark Watney Memorial Crater” where the Hab once stood.

Presuming I don’t fuck up with the hydrazine, there’s still the matter of burning hydrogen. I’m going to be setting a fire. In the Hab. On purpose.

If you asked every engineer at NASA what the worst scenario for the Hab was, they’d all answer “fire.” If you asked them what the result would be, they’d answer “death by fire.”

But if I can pull it off, I’ll be making water continuously, with no need to store hydrogen or oxygen. It’ll be mixed in to the atmosphere as humidity, but the Water Reclaimer will pull it out.