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Caver Ottavia Piana has been airlifted to hospital after a painstaking rescue deep underground in a cave system in the Bergamo area of northern Italy.

Instagram photo seekers are "killing" special places, says a caver, after volunteers hauled piles of rubbish out of a 19th Century mine filled with dumped cars.

But in 2004, Benn met Gulley—an accomplished caver—through a mutual friend.

An out-of-the-blue email from local caver and study co-author Eric Richards offered an unexpected method of time travel: repelling hundreds of feet down into Utah's caves to find what may have fallen in -- and when.

On Monday evening—nine days after the call for help was issued—American caver Mark Dickey, who fell seriously ill 3,400 feet deep inside a cave in Turkey, was successfully rescued.