iPhone 7 Plus passes the ultimate underwater test in subarctic Siberia

Next day he got his friend Fedor to dive in and retrieve it. 

The diver is seen on the video in a plywood hut covering the ice hole that fishermen use here on the Lena River in Yakutia to offer some protection against the bone-chilling cold. 

The water temperature was around 4C, and the phone fell to a depth of more than 1 metre. Diver Fedor had to go under three times before he located the cell phone.

He surfaced telling his friend: 'You've got a missed call.'

Not only was the device still working, but in the 13 hours underwater its battery had only gone down from 35% to 19%.

'So folks, buy iPhones,' said the diver.