In 1886, terrified witnesses off Provincetown, Massachusetts, reported encounters with a gigantic sea serpent—but when a mysterious monster skeleton washed ashore in 1939, cameras captured evidence that reignited one of Cape Cod's greatest cryptid mysteries. Join Jeff Belanger and Ray Auger as they investigate the legend, the photographs, and the question that still haunts New England's shores: what really washed up on that beach?

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