London - A British tourist severed an artery while using a 72ft (about 22m) "extreme" waterslide.
Jade Graves, 29, lost four pints of blood and needed a transfusion as well as an operation to repair the blood vessel.
The incident happened on the Space Jam slide at Aqua Paradise Water Park in Nessebar, Bulgaria.
Graves said she followed advice from the lifeguard on duty to cross her arms and legs on the slide but at the end she felt intense pain in her lower pelvis and saw her legs "running with blood".
She became "faint and breathless" and was taken to hospital in nearby Burgas for surgery.