The potential presence of Type B killer whales swimming at the mouth of the Tamar River is proving a tantalising mystery.
That sub-species has never ever been officially documented anywhere off the East Coast of Australia.
Dean Hodgetts took video from his boat on Sunday near Low Head, not realising how special the footage would become.
"We saw the spray and I thought it was dolphins or seals to start with, thinking they were feeding on salmon, so we raced up there to try and catch a few and they disappeared, as we were just cruising along they popped up alongside us, they were motoring along at probably about 10 kilometres an hour and the size of them was immense."
Type B killer whales would normally be confined to Antarctic waters feeding on seals at this time of year.
Photo by Robert Pitman https://commons.wikimedia.org/wiki/File:Killer_Whale_Tipe_B.jpg