K-278 Komsomolec - the wreck of the ship has been resting at the bottom for over 30 years The ship, considered one of the most valuable in the Soviet navy fleet and one of the first submarines ...

What You Need to Know: The Soviet K-278 Komsomolets, a titanium-hulled "Mike-class" submarine, set the record for the deepest dive by a military submarine in 1984, descending over 1,000 meters.

The Type XXI design inspired the Soviet Union Whiskey-class and the U.S. Tang-class submarines, which remained in service in both navies until the 1980s.