Testing ice as approaching edge of open lead at bottom of Peirce's Island 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 tests ice thickness with his ice pick and axe as he approaches the edge of the open lead. Process Observed: Ice ThicknessOpen Water (Lead) Date Process Observed: Wednesday, March 23, 2011 Galleries: Bottom of Peirce's Island Gallery