At 88, the Canadian reflects on a golden era of underwater discovery and how shipwrecks and the cruel sea are the ‘greatest of all teachers’ At 88, the Canadian reflects on a golden era of underwater discovery and how shipwrecks and the cruel sea are the ‘greatest of all teachers’ MacInnis diving in Lake Huron, off Tobermory, Canada , in 1969. Photograph: Don Dutton/Toronto Star/Getty Images MacInnis, left, in the Sub-Igloo, with Don King, whose company made the polar dive station’s plastic