The Sea Hunters - Season 5 (2006)

The flagship of Czar Nicholas II's navy, the Russalka mysteriously vanished in 1893. Apparently defying gravity and physics, it seems to have sunk vertically and now stands upright in the ice-cold waters off Estonia. The Sea Hunters explore this odd wreck, perhaps the best-preserved example of a sunken ironclad.

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Crackpot idea, or work of genius? To protect Allied convoys during World War II, eccentric scientist Geoffrey Pyke proposed a manmade island of ice as a floating airbase. Now, in the thin atmosphere of the Canadian Rockies, the Sea Hunters dive a mountain lake to find the ice island's prototype.