Submarines have quietly become some of the most powerful weapons in modern naval warfare.

The US Navy has taken delivery of a new 8,000-ton attack submarine built to slip quietly into contested waters and support elite special operations forces far from shore. The boat’s combination of low ...

Submarines have evolved gradually from their inception, when they were basically just submersible tubs. Today, however, the submarine is a remarkable machine, worth billions a piece, and loaded with ...