The SS Edmund Fitzgerald freighter sank in Lake Superior during a storm in 1975, killing all 29 crew members.

Only a handful of people have ever visited the wreck, either by submersible or, in one case, a dangerous scuba dive.

Explorations of the wreck, including the discovery of a crew member's body, have caused controversy among the victims' families.

Divers and explorers who visited the site describe it as a sacred gravesite and a privilege to witness.

Terrence Tysall was carrying everything he needed to stay alive on his back one September day in 1995 as he jumped into Lake Superior and started his death-defying descent, traveling more than 500 feet through dark, 34-degree water to the bottom.

When Tysall and his diving partner, Mike Zlatopolsky, made it to the clay floor of Lake

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