Russia has denied that its submarine is experiencing mechanical problems—but a Russian military blogger has speculated that it was forced to surface following a catastrophic fuel leak.

In 1963, USS Thresher sank, killing all 129 aboard—sparking decades of speculation. It remains the deadliest submarine ...

A RUSSIAN submarine capable of carrying nuclear weapons suffered a “serious accident” in the Mediterranean, according to reports. Fuel is now said to be leaking from Putin’s ...

All 53 crew aboard an Indonesian submarine that disappeared last week were killed, the military said Sunday as it confirmed the vessel had been found in pieces on the seafloor. Authorities said that ...

Russian authorities have allegedly allocated $369 million to recover the remains of K-27 and K-159, two Soviet era submarines ...

A missing Indonesian submarine has been found cracked apart on the seabed in waters off Bali, the military said Sunday, as it confirmed that all 53 crew perished in the disaster. Authorities said that ...

MOSCOW (AP) — The fire safety system on a brand-new Russian nuclear submarine accidentally turned on as the sub was being tested in the Sea of Japan, spewing a gas that suffocated 20 people and sent ...

Russia will begin preparations in 2026 to recover two Soviet nuclear submarines from Arctic waters, with operations set to ...

President Donald Trump said a U.S. strike destroyed a submarine heading towards the United States with illegal narcotics and killed two people onboard, while two other passengers survived and are ...

THIS IS A RUSH TRANSCRIPT. THIS COPY MAY NOT BE IN ITS FINAL FORM AND MAY BE UPDATED. KYRA PHILLIPS, CNN ANCHOR: We begin with the latest on the collision of a U.S. nuclear sub and a Japanese fishing ...