Using axe to test thin ice at lower end of Hotcake Slough No flash player has been set up. Please select a player to play Flash videos. Video not playing? Update your browser or download the video clip Knut Kielland uses his axe to demonstrate how thin the ice is at the lower end of Hotcake Slough. Process Observed: Open Water (Hidden)Ice ThicknessThin IceIce Strength Date Process Observed: Saturday, March 31, 2012 Galleries: Main part of the Tanana River at lower end of Hotcake Slough Gallery