My thanks to the Natural History Museum (London) for the speedy reply!
Below:Monterrey Bay Aquarium Research Institute (c)2013
Bearing in mind the 1953 report of an oddly coloured HUGE mass that killed a shark in front of a diver I find this video footage absolutely fascinating!
But it is not a mystery -not since 1967! It's a Deepstar enigmatica -a type of jellyfish. You can read more here:
Pursuing The Strange & Weird
From Dead Aquatic (Humanoid) Creatures, the giant squid and yet undiscovered sea creatures;submarine and ships crews encountering true leviathans. Extinct animals at sea that have been re-discovered and the subject of Sasquatch and other Hominids around the world as well as two early French UFO entity cases that still baffle, ghosts, strange creatures-and the Star-Child hoax. All dealt with by the naturalist and pursuer of the strange and weird