Feb 2026
World's Deepest Marathon: Watch the Official Documentary
Following its world premiere in Cape Town, Chrome's official documentary for the World's Deepest Marathon is now available to watch in full.
World's Deepest Marathon is a powerful new film that follows an extraordinary group of runners as they prepare to take on the challenge of a lifetime, running a full marathon in the depths of Boliden's Garpenberg mine - 1,120m below sea level.
Watch the documentary below! And learn more about the project here.
