Could this giant jellyfish, spotted in the waters off Pendennis Point in Falmouth, be the largest ever photgraphed in the UK?
That's the claim of archaeologist Robert Lenfert, 42, and his wife Natasha, 39, met the giant creature as they explored the crystal clear waters last week.
Robert believes it's the biggest jellyfish ever pictured in UK waters.
Barrel jellyfish are usually found in tropical areas but warm weather has led to increased sightings round our south west coast, even in river estuaries.
Experts say their sting is very minor but the scary-looking fish have spooked bathers because of their massive size and weird appearance.
Robert said: "It was a good four feet long, maybe longer, but totally harmless. I passed the camera to my wife so she could take our picture together.
"We were swimming very gently beside it for half an hour. At one point it got itself caught between rocks so I used a flipper to guide it to safety.
"I've been diving for 15 years all around the world, but I've never seen one before - it was an amazing sight."