However, the temperature data does not go entirely well with this theory, as great white sharks are able to maintain a body temperature of up to 10-14 degrees Celsius higher than the surrounding water – and the tag showed a striking difference with the cold 600-meter-deep water temperature.

While cases of killer whales or orcas attacking sharks are well documented, it is not typical of these mammal species to dive several hundreds of meters below the surface of the ocean, because they need fresh air to breathe. The deepest known dive for a killer whale is said to be about 260 meters (850 feet).

But such a dive would be possible for another huge sea mammal – the sperm whale. According to Riggs’ findings, some whalers saw a group of sperm whales passing along the Western Australian cost at the time in question. The filmmaker said he plans on interviewing the whalers for the documentary.

http://rt.com/news/165096-super-predator-shark-australia/