The high-performance catamarans are equipped with hydrofoils that lift them out of the water as well as an underwater turbine ...

Submarines' top speeds are different when they're underwater than when they're cruising on the surface -- and not always in ...

In 1951, the Becuna underwent a Greater Underwater Propulsive Power 1-A conversion ... while the aft torpedo room in the back of the boat had four tubes. The forward torpedo room also featured ...