In the rugged landscape of British Columbia, a team of modern-day explorers embarks on a perilous mission to uncover the secrets of a long-lost steam locomotive. Decades after a tragic accident sent the train to the bottom of the deep, dark Slocan Lake, the team uses cutting-edge technology to navigate the treacherous waters and search for the remnants of a bygone era. As they delve into the history of the region and the stories of those who lived through the mining boom, they face the challenges of the elements and the uncertainty of what lies beneath the surface, hoping to bring a piece of history back to light.