Beneath the crystal-clear waters of Geiseltalsee a flooded former coal mine lie submerged forests, roads, concrete structures, and remnants of its mining past.

Beneath the crystal-clear waters of Geiseltalsee a flooded former coal mine lie submerged forests, roads, concrete structures, and remnants of its mining past. [▻](https://video.twimg.com/amplify_video/2081435613966819328/vid/avc1/720x1280/vzNMxLrL5QXHg55M.mp4) [▻](https://video.twimg.com/amplify_…