Watch the intense underwater challenge as a homemade submarine faces off against a real one.

Taiwanese state-owned shipbuilder CSBC Corporation confirmed that the Hai Kun had successfully conducted a shallow-water submerged navigation test, with further tests planned under the supervision of ...

During a series of raids, Spanish police said they seized a homemade narco-submarine that was used to transport 2 tons of cargo. The police found the sub, which is about 30-feet long and 10-feet wide, ...