A program for American Youth which is a Great Lakes Treasure! Right: Cadets learn about the latest technology in lake bottom mapping from Pat Sanders, president of HYPACK, Inc. Far left: Proud Sea Cadets in formation during Summer Training. Left: An underwater geological study at Thunder Bay National Marine Sanctuary becomes a documentary film as research divers explore limestone formations. Learning about the Great Lakes to protect the Great Lakes. Left and below: Luke Clyburn and his crew were honored to assist Jean-Michele Cousteau and his team as they filmed a PBS documentary at the Thunder Bay National Marine Sanctuary. Above: Cadet divers listen intently as geologist John Zawiskie, of Cranbrook Institute of Science, describes features of the lake floor.