Where Starships Go to Die (Where Starships Go to Die #3)

The near future - humankind's first starship crash lands in the most remote spot on earth, the underwater spacecraft graveyard known as Point Nemo. While diving in the deep to salvage this technological marvel, our heroes discover the wreck of a doomed 1980s Soviet Mars mission, a nuclear warhead... and an alien being that's killing their crew one by one.