The deepest-diving submarine

Fifty years ago, a two-man crew aboard the Trieste descended to the deepest surveyed point of the Pacific Ocean, a hole in the Mariana Trench. They are the only two people to have been to the gorge in the ocean floor, known as Challenger Deep, which is 35,800 feet below the surface. They descended inside a sphere that hung below a 60-foot-wide chamber filled with gasoline, water and iron pellets.

© 2010 The Washington Post Company