The man who died after snorkeling in Silfra fissure last Friday died of a heart attack, according to RÚV. This is the preliminary result of an autopsy. There are no indications of drowning.
The man was a US citizen, born in 1951. He was snorkeling with his family in Silfra fissure, Þingvellir National Park, when he called out for help, because he was experiencing a shortness of breath, RÚV reports. He lost consciousness shortly after a guide came to his aid and was subsequently transported by helicopter to hospital, where he was pronounced dead.
Since the accident, stricter rules have been adopted in Silfra, expected to drastically limit the number of people diving there. Since 2010, five people have died in Silfra.