We can make amazing discoveries billions of miles away in space but we can't find a sub within 4km of water when we have a good idea where it was lost... Man we need to ocean better.
@Stevo: It's a depth of roughly half the height of Mt. Everest's highest peak, and per square inch the pressure is 6,500 lbs., nearly 400x that of air pressure at the beach. Light barely reaches to any meaningful depth in the oceans, and sound is the only thing that transmits, however dicily at long range. It's hard to find what you can't see or hear at all unless you're on top of it. The North Atlantic is around 16 million square miles, breadth and depth. That's why we rely on cables, alas.
@Stevo: The pressure/sq.in. at the Titanic's depth is roughly that of the Space Shuttle engines at liftoff.
As a Cold War submariner wrote years back, when you're down at max depth, it like you're in a tin can in an Olympic swimming pool full of concrete.
@thedisasterautist I would still like to think that the human species should be a bit better at understanding the bodies of water that make up 70% of the surface of this planet. Don't get me wrong, i'm no expert on the matter, but we have so much technology it's disappointing to see the best chance of finding them is with planes and buoys.