Divers swimming off the coast of Falmouth in Cornwall spotted a jellyfish as large as a human on Saturday.
Lizzie Daly and Dan Abbott, who discovered the specimen, estimated it to be around 1.5-metres-long — as large as the divers themselves.
Daly, who is a wildlife biologist, said that she has been diving in locations across the UK to mark Wild Ocean Week. The diver showcased her astonishment at their discovery on Twitter.