The Navy says the collision occurred about 9:30 a.m. Thursday. There were no injuries and only minor damage.
The nuclear-powered submarines involved were the Groton-based USS San Juan, a fast-attack sub, and the USS Kentucky, a Trident. Both were returning to Groton for extensive checks.
The San Juan will return to the submarine base in Groton, while the Kentucky, too large to make it up the river, will be inspected at submarine-maker Electric Boat on Long Island Sound in Groton. The San Juan carries a crew of 130, while the Kentucky has 155 men on board.
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