In this June 15, 2010 file photo, Peter McKibbin operates an undersea robot camera to search for the shipwreck of the tugboat William H. McAllister in Lake Champlain, Vt. The EPA is soliciting bids from underwater salvage companies to send divers into the tugboat sunk in 160 feet of water beneath Lake Champlain. The EPA is seeking to determine if the tugboat, sunk in 1963, could leak fuel into the lake.