In 1968, a U.S. Navy Attack Submarine Exploded Underwater. No One Knows Why

[Tony]

The conspiracy theory is that the Scorpion was somehow caught up in some kind of Cold War skirmish, and that the Soviet flotilla had sunk the sub. An unusually high number of submarines were sunk in 1968, including the Israeli submarine Dakar, the French submarine Minerve, and the Soviet submarine K-129. According to conspiracy theorists, the Cold War had briefly turned hot under the waves, leading to the loss of several submarines. Unfortunately, there is no actual proof, nor an explanation for why a Soviet task force with only two combatants could manage to kill the relatively advanced Scorpion. http://nationalinterest.org/blog/the-buzz/1968-us-navy-attack-submarine-exploded-underwater-no-one-24586