Danger: solar gamma radiation burst, lack of oxygen, lack of food and drinking water, cold, ice storm, hostile killing robots, Martian nematodes, dark and selfish villains (I originally expected a big Martian monster to break out of the ground, but No), lack of fuel.
Strange settings: launch cyanobacteria to Mars, trying to create oxygen; nematodes eat cyanobacteria, eat space supply ships, cannibals... basically eat everything and release oxygen; robots have self-protection awareness, in order not to Being destroyed will kill all the original owners.
The plot is good, very attractive, but also horrifying and suspenseful enough to hang people's appetite.
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