Police responded to Boston Harbor after a small submarine was spotted.
Family and friends who lost loved ones when the USS Thresher sank 50 years ago joined in tossing wreaths into the water Saturday in an emotional service in remembrance of the 129 Navy crew members and civilian technicians who lost their lives in the deadliest submarine disaster in U.S. history.
A former shipyard worker accused of setting a fire that caused about $450 million in damage to a nuclear submarine has pleaded guilty.
A fire-damaged submarine is expected to return to Navy service by the middle of 2015 following the replacement of cables, pipes and other scorched interior components.
Divers have discovered a World War II-era German submarine nearly 70 years after it sank under withering U.S. attack in deep waters off Nantucket.
The U-550 was found on Monday by a seven-man group, some of whom have been searching for the lost U-boat for several years.