The word submarine means 'underwater' or 'under-sea' (as in submarine canyon, submarine pipeline) though as a noun it generally refers to a vessel that can travel underwater. The term is a contraction of submarine … See more

Before and during World War II, the primary role of the submarine was anti-surface ship warfare. Submarines would attack either on the surface using deck guns, or submerged using torpedoes. They were particularly effective in … See more

All surface ships, as well as surfaced submarines, are in a positively buoyant condition, weighing less than the volume of water they would displace if fully submerged. To submerge hydrostatically, a ship must h… See more

A typical nuclear submarine has a crew of over 80; conventional boats typically have fewer than 40. The conditions on a submarine can be difficult because crew members must work in isolation for long periods of ti… See more

• Autonomous underwater vehicle
• Coastal submarine
• Columbia-class submarine
• Depth charge… See more