A 2022 satellite photo shows a large plume of discolored water rising from the undersea Kavachi volcano, during an eruption ...

In 1917, a civil engineer pioneered the first deep-sea vehicle to attempt filming underwater. A century later, we have James ...

State media released photos showing what it called “a nuclear-powered strategic guided missile submarine,” as it reported ...

North Korea has conducted a slew of underwater-launched ballistic missile tests since 2016, but all launches were made from the same 2,000-ton-class submarine which has a single launch tube.

Kavachi is a submarine volcano that is part of the Solomon Islands, around 15 miles (24 kilometers) south of Vangunu Island. Its peak stands roughly 3,600 feet (1,100 meters) above the seafloor ...

North Korean state media on Saturday released photographs of national leader Kim Jong Un inspecting progress on a ...