NAVY NUCLEAR SUBMARINE and MISSILE CRUISER COLLIDE off FLORIDA COAST DURING TRAINING EXERCISE ..

Close call: Pentagon officials said the sub's nuclear reactor was not affected by the collision

ABC reported that the vessels were preparing for an upcoming deployment as part of the strike group for the aircraft carrier USS Harry S Truman, which was also on hand.

According to a Navy official, at around 3.30pm, the bridge watch aboard the San Jacinto saw the sub rise to periscope depth less than 200 yards ahead of them.

The bridge ordered 'all back,' but it was too late and the vessel slammed into the Montpelier.

As a result of the collision, the sonar dome of the missile cruiser became completely depressurized. Located below the water line of surface warships, sonar domes give the bows of warships their signature globular shape.

Navy nuclear submarine and missile cruiser COLLIDE off Florida coast during training exercise | click  for  more..