It sounds like a tall tale told too late at night. A submarine in the Rocky Mountains, sitting on a frozen lake nearly nine thousandfeet above sea level, more than a thousand miles from the nearest ocean. But this story is not folklore. It is documented, photographed, and quietly stubborn in its facts.

In the winter of 1944, residents of Central City, Colorado,watched a rusted, cigar shaped vessel rise from the ice of Missouri Lake after forty-five years underwater. The band played a patriotic tune better suited to a harbor than a mining camp, and someone cracked a joke about the longest crash dive in history. They were not wrong.

This is the story of the Rocky Mountain submarine, built insecret in 1898 by a skilled and eccentric engineer named Rufus T. Owens. It is a story about ambition, miscalculation, and the peculiar American habit of attempting the impossible simply because no one has proven it cannot be done.