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Ancient shipwrecks sunken off the coast of America's Goat Island lead researchers to one of the greatest vessels in the Age of Exploration. Invasive ant species on a small island in the Pacific Ocean drive volunteers to explore haunted US military structures. Intriguing shipwrecks and dark underwater tunnels take divers back in time to an unknown chapter on Canada's Bell Island. Massive stone disks found on a tropical Micronesean island in the Pacific Ocean reveal a unique trading system.
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