A British yacht captain has told how a pod of killer whales sunk his £100,000 boat during a "terrifying" two-hour attack - in the Mediterranean Sea. Robert Powell, 59, said the pack of five orcas encircled his 39ft sailing boat ‘like wolves’ and took it in turn to smash into the ship as he sailed off the coast of Spain. He and two crew were 22 hours into a ten-day trip between Vilamoura, in Portugal, and Greece when the animals began their violent “attack” at 8pm on Wednesday, roughly two miles offshore. After they knocked out the boat’s rudder, the animals spent the next few hours “taking it in turns” to charge into it - causing the vessel to buckle under the pressure. Robert, who had radioed for help not long after the orcas began their assault, said he and his crew had felt like “sitting ducks” as they waited for rescue.