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.

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 ...

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: ...

While all that is very cool, there’s one downside to riding in a deep sea submarine: you might end up sounding pretty silly. Submarines are pretty cool bits of kit.