The bathysphere—bathys is Greek for "deep"—was developed in the early 1930s by William Beebe and Otis Barton, two explorers from the New York Zoological Society. It was a 4,500-pound hollow steel ball ...

CHALLENGER DEEP, MARIANA TRENCH, SOUTHEAST OF GUAM (WHTM) — The first dive to the deepest part of Earth’s oceans had its start with a record-breaking ascent into Earth’s atmosphere. On May 27, 1931, ...

In summer 1958, 27-year-old Navy Staff Lt. Don Walsh was assigned to the submarine tender Nereus, part of Submarine Flotilla 1 at the sub base on Point Loma. It was a safe, steady desk job, but less ...