Canadian researchers working off the west coast of Vancouver Island were shocked when a giant octopus attacked their expensive mini submarine.

The operator of the remote-controlled submarine tried to protect his $200,000 “uninsured” equipment and switched the thrusters to full reverse in an attempt to blast the sea creature with seabed particles. And it worked. The giant octopus, a mature male weighing over 45 kg, lost its appetite and let go.

The rare footage you’re about to see is believed to be the first documented attack of an octopus on a sub.