Scientists have recorded the first footage of a great white shark attacking and killing an enormous humpback whale. Photo taken from a drone off the coast of South Africa shows the 13ft-long shark hunting the whale which was around 33ft long and in ill health. Ryan Johnson, a marine biologist who observed the unlikely massacre, said the ordeal lasted about 50 minutes before the whale died. Mr Johnson said the great white was very 'strategic' in taking down the behemoth. It initially severed an artery or vein on the whale's most vulnerable area, its tail, before pulling the ailing leviathan underwater and drowning it. While humpback whales are known to attack sharks it is very unusual for the giant mammals to be the victims.