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 ...

Science: Deepest Dive. 4 minute read. ... Previous official record was 306 ft., set in 1915 by Frank Crilley of the U. S. Navy who reached the submarine F-4 at the bottom of Honolulu’s Pearl Harbor.

Vintage photos show how deep sea diving and exploration has evolved over the years. ... A diver and a two-man submarine search the ocean in 1963. OFF/AFP/Getty ...

Clearly, then, there's a huge disparity between different types of submarines and just how deep they can dive, and the lack of official data and precise numbers only muddies the matter further.

A safe dive depth for modern, Los Angeles-class submarines in the U.S. arsenal to be roughly 1,500 feet — with a maximum descent distance of around 3,000 feet.

The submarines displaced 2,300 tons surfaced/3,200 tons submerged and were just 267 feet in length and had a beam of 31 feet. Notable Project 705 Lira or Alfa-class Facts: ...