From the publisher (best-sci-fi-books.com): "Science fiction writers love sticking people in tiny metal cans and hurling them into environments where everything is trying to kill them, so it's no surprise that some great SF books take place deep underwater, where exposure to the pressure kills people much faster than exposure to the vacuum of space.
An unexpected pattern: many of the books below focus on the psychology of their characters more than typical science fiction. This may be because in underwater science fiction stories, the protagonists are generally more isolated, since there are no new planets to arrive at, and spend a lot of time with each other in their little bubble of air, squabbling with their shipmates and their own personal demons.
These books are sorted by popularity, based on star ratings and number of reviews on amazon.com."
