Boot melting out of ice found on Everest, may be of climber lost 100 years ago

A boot melting out of ice with a foot inside it was found by National Geographic's documentary team on Mount Everest last month. The boot is believed to have belonged to Andrew Comyn Irvine. He'd went missing 100 years ago while attempting to become the first person to climb the mountain, 29 years before Edmund Hillary and Tenzing Norgay.