Data coming back from a series of shark tags are showing these remarkable animals diving to 1000m or 3280 feet:
Up to 70 per cent of the time they are near the surface but this winter one of the whites dived. "We've got what we think is a world record of 1000 metres for a white shark."
They believe it would have gone after a giant squid or phosphorescent fish. At that depth it would be pitch black and the white would have been guided in by the fish glow. A tag on a white shark popped up off Mana Island but its data was partly corrupted. The shark had been north to the tropics for winter and had come back in summer.
Three of six sharks tagged at the Chathams were found to have swum 3000km north to Tongatapu, the main Tongan island.
And you wonder why we love shark science so much?