On May 7, 2014, after eight hours of hiking and swimming — while wearing insulated dry suits — polar explorers Eric Larsen and Ryan Waters reached the North Pole.
They'd traveled 3.5 nautical miles that day, the last leg of an almost 500 mile journey that took 53 days from start to finish.
As Larsen recently explained to Business Insider and describes in his book, "On Thin Ice: An Epic Final Quest into the Melting Arctic," written with Hudson Lindenberger, many expect their trek to be the last unsupported, unaided expedition across the frozen Arctic to the North Pole.
Here's what that journey looked like.
The team packed two sleds full of gear, each weighing 317 pounds. The shotgun saved their lives on day five when they used it to scare off a mother and cub pair of polar bears.
The going was so rough at the start that they covered less than seven miles in those first five days.
Broken up sheets of ice crash into each other, forming massive hard to cross obstacles.
See the rest of the story at Business Insider