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Reading: Thousands of stinging jellyfish surround diver as heatwave sparks huge invasion
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Treasure hunter James Clarke surrounded by swarms of stinging jellyfish during epic dive in Brixham, as UK heatwave sparks dramatic surge in compass and lion's mane blooms.
Nature and Wildlife

Thousands of stinging jellyfish surround diver as heatwave sparks huge invasion

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Last updated: 2025/07/08 at 12:06 PM
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James Clarke encountered thousands of stinging jellyfish underwater. (Jam Press/James Clarke/Adventures and Autism)
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Thousands of stinging jellyfish have surrounded an underwater treasure hunter after sizzling UK temperatures sparked a huge invasion.

James Clarke encountered the huge swarm of moon, compass and lion’s mane species.

While moon jellyfish are harmless to people, compass and lion’s mane jellyfish both have a sting which can be very painful.

READ MORE: Tourist guide captures stunning images of huge whales a stone’s throw from coast

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James, who regularly films his dives as an underwater treasure hunter, was astonished by the spectacle off the coast of Brixham, Devon, on Saturday (5 Jul).

Treasure hunter James Clarke surrounded by swarms of stinging jellyfish during epic dive in Brixham, as UK heatwave sparks dramatic surge in compass and lion's mane blooms.
James Clarke. (Jam Press/James Clarke/Adventures and Autism)

It is believed Britain’s sizzling summer heatwave has led to the blooms.

“I was underwater metal detecting just off the breakwater beach for historical items that could be interesting,” James told What’s The Jam.

“It’s an area with a maritime history of around a thousand years.

“I had such a good time, and seeing the jellyfish really was incredible.

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(Jam Press/James Clarke/Adventures and Autism)

“It was beautiful to witness.

“It’s gone down as one of my all-time favourite dives.

“It was so epic to see so many of them.

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“They were mostly moon jellyfish, but there were a lot of compass jellyfish and blue jellyfish, and even a lion’s mane jellyfish.

(Jam Press/Mr Fish)

“The moon jellyfish are harmless to humans, but the others pack a bit of a punch.

“Unfortunately, I didn’t find anything interesting, but I was limited to an hour of air, so it was a bit like looking for a needle in a haystack.”

Swarms have also been spotted at the foot of a cliff in a popular beauty spot.

Last Tuesday (1 Jul), Tristan Northway, skipper of the Four Reasons charter boat, saw masses of the creatures off Berry Head, Brixham.

READ MORE: Friendly turtle shows off to divers

Tristan Northway. (Jam Press/Mr Fish)

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