NASHVILLE, Tenn. (WKRN) — Submarines are a nuclear weapon used in the United States Navy, with sailors aboard, loading torpedoes. This job is hard to fathom, with usually 150 sailors in tight quarters ...

There are many difficult things about sending humans to space, from dealing with health effects on the human body to the risks of launch and landing to keeping astronauts well-fed and supplied.

Submarines are emerging as a unique research platform to study human adaption to extreme environments—from ocean depths to ...