after Guernsey's Committee for Economic Development

There are 15 Britons still being treated in hospital, with six in intensive care, the hospital said.Andrew Davies, a British passenger onboard the Boeing 777-300ER, told the BBC's Radio 5 Live that the plane "suddenly dropped... [with] very little warning".

"The thing I remember the most is seeing objects and things flying through the air. I was covered in coffee. It was incredibly severe turbulence," he said.Another passenger said those not wearing seatbelts were "launched immediately into the ceiling"."Very suddenly there was a very dramatic drop, so everyone seated and not wearing a seatbelt was launched immediately into the ceiling," 28-year-old student Dzafran Azmir told Reuters.

"I saw people from across the aisle just going completely horizontal, hitting the ceiling and landing back down in really awkward positions. People getting massive gashes in the head concussions."Mr Azmir added that people's heads had slammed into the overhead panels above the seats and "pushed through" some of the panels.

Another Briton, Jerry, 68, was travelling to Australia for his son's wedding. He said there was no warning before the "plane plunged".

"I hit my head on the ceiling, my wife did - some poor people who were walking around ended up doing somersaults," he recalled.He soon grew to love the cavern system, which dates back 350 million years, and by the age of seven he had explored it more than 100 times.

"It was surprisingly normal. You didn't think much of the cave because you became so used to it," he said.Growing up, Oliver said his friends thought it was "cool" and he even filmed a music video with his band in the caves.

"I think it was more when I went to university, you got people asking what your parents do," he added."When I said 'oh, we have a cave', the look on people's faces was quite interesting."