This is one of the coolest (no pun intended) sound design projects ever. Marlin Ledin rode his bike and camped around the Apostle Islands of Lake Superior covering about 150 miles on the ice recording the creaks and groans of the shifting ice plates. Listen to his recordings and checkout photos and videos of his expedition at www.bikingtheapostles.com. Marlin describes the ice sounds:

The Lake Drums, as some people call them, are an amazing phenomenon that rank right up there with Aurora Borealis. Lake drums, or drumming perhaps, occurs when a shift in the ice creates friction between sheets of ice, like tectonic plates of the earths crust. The unique sounds created come after these shifts in the ice. I ventured out and captured some of these sounds with modern recording techniques.