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Sounds. Hello, welcome to the Witness History Podcast from the BBC World Service with me Larsh Bravanga.

In March 1980, Norway is 10 years into a new lucrative era as an oil and gas producer, thanks to vast reserves found in the North Sea. Halfway between Norway and the UK,

the Alexander Shelan platform serves as a floating hotel for workers on nearby oil platforms.

212 men are either relaxing after finishing their shifts or getting ready for work.

The weather has been getting worse. The weather has been getting worse all day.

By 6 PM, the waves are 12 meters high and the winds are battering the platform.

Suddenly there was a bang.

I thought it was a very large wave hitting the platform and it was vibrating and so on.

And after a few seconds, there came another big one and then the platform tilted 15 degrees or something

Harivika is the radio operator on board. Inside his small communications room equipment

is now being thrown around as the enormous platform tilts dramatically.

The Alexander Shelan floats on five pontoon legs, all anchored with

gigantic cables to the sea floor. Those bangs were one of these legs snapping off in the storm. Now the anchor cables

...