WWII torpedo blown up at sea
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'Royal Oak torpedo' blown up at sea off Orkney

Navy bomb disposal experts have detonated a World War Two torpedo found in Scapa Flow in Orkney.

The weapons is believed to have been fired by German U-boat U-47 when it attacked the battleship Royal Oak in October 1939.

The loss of the ship while it was moored in Scapa Flow claimed the lives of 800 sailors.

A number of U-47's torpedoes failed to explode at the time of the attack.

Local historian Tom Muir and Lieutenant Commander Tony Hampshire have been speaking to BBC Scotland's David Delday.