I used to command this deep sea submersible with a crew, mostly for mining and stuff. Then this one time, a submarine containing nuclear missiles had an accident and sunk near the spot. So me and my crew had to take a bunch of navy seals down there to investigate. But the guy in charge went nuts, which became a much bigger problem when we discovered an alien species existing down in the nearby trench, who were technologically advanced enough to control water in ways we can't imagine. Between that and the nutcase and my neurotic, soon-to-be-ex-wife who was a nagging bitch, I nearly lost my life, although thankfully, it all ended happily, with humanity learning a thing or 2 in the process.
True story folks.