Japan now operates five cutting-edge Taigei-class submarines, in addition to its 12 Soryu-class and 6 Oyashio-class vessels.

The U.S. Navy has reached a Cold War-era milestone in the Arctic, deploying two Virginia-class submarines beneath the polar ice cap for the 100th time since World War II.

The Iranian warship that was sunk in the Indian Ocean likely didn’t have the technology needed to defend itself against submarines.

Here’s what you’ll learn when you read this story: For the first time, China has outstripped U.S. nuclear-powered submarine production. U.S. plans to shore up an aging submarine fleet are delayed.

The U.S. wants to fast-track outfitting Australia with nuclear submarines under the trilateral agreement between the U.S., Australia and the U.K. to beef up Australia’s submarine force aimed at ...