IRONMAN athletes were attacked by JELLYFISH while competing in the world championships in Hawaii as they feared for their lives.
The brutal event saw the best multi-discipline stars tackle a 3.8km swim, 180km cycle and marathon run on Sunday.
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But some high-profile names, such as Australia's Matt Burton, were forced to drop out of the race after suffering an "anaphylactic reaction" to jellyfish stings in Kona.
Dutch competitor Menno Koolhaas spoke about being attacked in the water after he recovered to finish fifth.
He said: "My heart was pumping like crazy and I thought I'm maybe gonna die or something.
"It started really bad – I got stung by a jellyfish and it was really, really painful.
"But Ironman is also a sport of being mentally strong and I had to be that and make the best of it.
"I think this was one of my best performances, but also mentally, which I'm really proud of. A first time Hawaii rookie and coming top five, I couldn't dream of more."
Meanwhile, Britain's Billy Monger made history by breaking the Ironman record for a double amputee by more than two hours.
The former racing driver, 25, finished in 14 hours, 23 minutes and 56 seconds.