Great white sharks are washing up dead on beaches with enlarged brains in what is becoming a spiralling marine mystery.

Scientists said the presence of killer whale DNA on the great white shark was the result of a "true predation event".

Over a year after a 15-foot great white shark was found dead with mysterious bite wounds and stripped of its internal organs, DNA analysis uncovered its killers. Two animals, orcas, also known as killer whales,

A diver has recounted a horrifying 15 minutes spent on the bottom of the ocean eye-to-eye with a circling great white shark off the South Australian coast.

Two divers have had a terrifyingly close call with a great white shark in the waters off Cape Jaffa – a 3.5 hour drive from Adelaide, 9 News Adelaide reports

Faced with a rash of shark deaths marked by brain swelling, Canadian and American scientists are trying to solve a marine mystery.