Bonne Terre Mines offers visitors a most unique experience. Bonne Terre Mines was a lead mine for over 100 years. It has since filled with natural water and is now the world’s largest fresh water dive. Because of the water conditions, visibility is over 100 feet, and the temperature of the water is consistently 58 F, with air temperatures consistently 62 F.
A tour of the Bonne Terre Mines will include mammoth architecture, cal falls, oar carts, scaffolding, grating, stair cases, pillars, slurry pipes, an original elevator shaft, and much more. A dive tour is even more illuminated. A spectacular sight is the Billion Gallon Lake, which has twenty-four underwater dive trails, taking its visitors through mammoth archways, calcium falls, gargantuan pillars, and mining artifacts left behind. The Billion Gallon Lake is illuminated for increased visibility of its natural state up to 100 feet below the surface, while dive tours average 40-60 feet.