In 1981 the Russian submarine U-137 went aground close to the town of Karlskrona in Sweden, and that was the start of a diplomatic incident that almost led to armed conflict between Sweden and Russia. This incident was later given the name Whiskey on the Rocks.

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In this video I explore the town of Karlskrona and I also dive deeper into the U-137 incident. There were many breaches of Swedish territory by the Soviet Union during the 1980s, but this was one of the most well-known cases - and one that became international news at the time.

The submarine that went aground was the start of it all, but it escalated with Russian war ships and other vessels closing in on Swedish waters, with orders to retrieve the submarine by force. Meanwhile, Swedish scientists detected that the submarine was carrying uranium - and that it was in fact loaded with nuclear weapons.

Eventually both sides stood down from further conflict, and the submarine was released to the Soviet fleet - but it was several days of nerve wracking diplomatic games until that conclusion was reached. And this video gives you a short glimpse into the whole event that became known as Whiskey on the Rocks.