This came out a couple of years ago; take a look at some of the local wildlife and maybe you’ll understand why I don’t like to swim in the ocean.
West Coast of Vancouver Island an 80lb Octopus Doflieni – Giant Pacific Octopus, tentacle spread of 16ft, charges an underwater robot (ROV)and wraps a tentacle around the vehicles manipulator claw, in full reverse the ROV blasts the octopus away with thruster/propeller wash.