submarines

Experts from within and outside OceanGate worried about the safety and development of the Titan as far back as 2018, years before its inaugural dive. One tells NPR its disappearance isn't a surprise.

Submarine hobbyists are helping scientists in Montana do environmental research on the state's lakes. Researchers couldn't otherwise afford to rent subs, and it gives the hobbyists a sense of purpose.

A once-secret underground naval base in Crimea designed to preserve Soviet submarines in case of a nuclear attack is now a museum with an anti-American message.