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Pictured: The Jenneau 479 boat Ataraxia.

A British sailor described his terrifying ordeal with a pack of killer whales which tried to topple his boat near the coast of Spain.

Alan Bruce, 63, was sailing a Jeanneau 479 boat from Gibraltar to Cape St. Vincent, Portugal, when a large black shadow slipped beneath it.

Suddenly he felt a violent thud and looked back to see a gigantic orca turning to follow him.