The deadliest attack submarines in the U.S. Navy thrive in the darkness of the ocean's depths, but every once in a while they need to rise to periscope depth so the crew can get a lay of the land.

The submarine carried out various peacetime missions ... it's easier for one's eyesight to adjust to total darkness from red light than from bright white light. This allowed crew members with ...

SEOUL, South Korea (AP) — North Korea unveiled for the first time a nuclear-powered submarine under construction, a weapons system that can pose a major security threat to South Korea and the US.

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