Tourist submarines offer a way for passengers to explore the ocean without having to train as a diver or grow gills. Staying dry is a nice perk, but the real appeal is seeing sea life up close without ...

Unlike large vessels traveling on the ocean's surface or most other vehicles on the planet, military submarines do not have windows. A submarine's commander can't tell their helmsman to hang a right ...

Diesel-electric submarines have diesel engines as well as electric motors. The diesel engines only work while the sub is on the surface, recharging batteries.