This is coolbert:
"'King-torpedo' and plan Sakharov. ( Сold war)"
"At the height of the Cold War, August 12, 1953 have been produced successfully tested the new Soviet weapons of terrible destructive force - a thermonuclear bomb. One of the creators of the bomb, the newly elected member of the Academy of Sciences of the USSR, the 32-year-old Andrei Dmitrievich Sakharov suggested as a 'means of delivery' to use the developed nuclear submarines of project 627, equipping each of them a giant torpedo under the 100-megaton thermonuclear charge (approximately 6000 times more powerful than the bomb dropped on Hiroshima). As conceived by the young academician exploding the U.S. coast ocean, these torpedoes were to cause a tsunami of unprecedented power, the height of 300 meters [one thousand feet], which would be simply washed off American cities, causing irreparable damage to the United States ...Began planning the development, 'King-torpedo' received code T-15 . . . the torpedo T-15 came as a preliminary design (1953), and in the technical design of 627 (1954). According to the draft, a huge torpedo weighed 40 tons, had a length of 23.55 meters and a [diameter of] 1550 mm [ one and one-half meters] gauge. [five feet]"
Type 627 a Soviet November class nuclear submarine.
"The Project 627 . . . NATO – November) class submarine was the Soviet Union's first class of nuclear-powered submarines."
One great detonation and the entire eastern sea-board of the United States washed away by a single tsunami of extraordinary proportions!
The megalopolis of the eastern United States stretching from Washington D.C. to Boston populated by about 100 million persons. All gone in the proverbial twinkling of an eye.
Conventional modern submarines having torpedo tubes of 533 mm diameter. A T-15 would be three times the diameter.