missing submarine: No food or water, it's designed to dive, look around and return to surface

[Lancero]

25. Mount Everest is a graveyard, filled with with hundreds of bodies.

People keep climbing it year after year, using the bodies of the dead as mile markers to determine how far up they are. Every year, the mountain gets a few new mile markers.

For certain kinds of people, their is quite the allure to desecrating a graveyard. No matter how risky - or expensive - it'll be. People keep lining up to all but climb over bodies on Everest, why would this be any different? If the sub does end up coming to rest with the remains of the Titanic, well... That's just another attraction, to entertain the next group of tourists.