I still believe that the closest that we may have come was that rogue Russian submarine off Hawaii.
***What year did this occur?***
Some time back in the late 1960’s a nuclear sub sank.Only a US satalite recorded it. Howard Hughs built a special ship (Glomar Challenger)to recover it. According to reports, the part of the sub with missles broke off and sank back into the sea.
This is some of the top secret info that was spilled by the Dems when it was revealed to them in the Watergate hearings.
The ship was the Glomar Explorer and its secret mission was to raise the K-129 that had sunk on April 11, 1968. The submarine sunk approximately 750 miles north west of Hawaii. The mission to raise the submarine was known as Operation Jennifer and became public in 1975 after the Los Angeles Times printed an article about the plan, afterward followed by articles in the New York Times. One article I read gave 4 possible explanations for the submarine sinking; 1). hydrogen explsion of the batteries while charging, 2). collision with the USS Swordfish SSN 579, 3). missile explosion caused by leaking leaking missile door seal, and 4). the vessel exceeding its operational capabilities.