I’m stranded on Mars.
I have no way to communicate with Earth.
If the Oxygenator breaks down, I’ll suffocate.
If the Water Reclaimer breaks down, I’ll die of thirst.
If the Habitat breaches, I’ll just kind of explode.
If none of those things happen, I’ll eventually run out of food and starve to death.
The Martian is the story of Mark Watney who is stranded Mars and his attempts to survive.