Many people consider that the method of slaughtering whales is extremely cruel. Although whaling fleets may be highly sophisticated, equipped with sonar, helicopters, long-range explosive harpoons and factory ships, the actual kill is barbaric. The whale is killed by a 90kg, 2 metre-long iron harpoon, shot from a 90mm cannon. The harpoon head contains a time-fuse grenade which, literally, blows the whale's insides apart seconds after impact.