An Alaskzn Forum thread with lots of pictures

"It may surprise you as to why this incredible immensive amount of work is done. Why not just go around the obstacles ?As I show you these images, then you will understand why. The ice is a very dangerous environment to live. far out there, you better know exactly what your doing and why, things can change out here rapidly, this is the main reason for going through obstacles, rather than around them. A (wide) straight trail is the quickest way off the ice, in an emergency!"

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