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First among the USA’s great dive sites is the Bonne Terre Mine in Missouri, which is about an hour’s drive south of St. Louis if you take Highway 67. Composed of seven miles of abandoned mine tunnels, the Bone Terre Mine is the only aqua-subway system in the world. Before it was abandoned in 1962 when groundwater started seeping into the tunnels, Bonne Terre Mine used to be a source of lead for more than a generation. The wonder of this dive site is that it runs directly beneath the town’s train station, a funeral parlor, a pharmacy, a bank, and even the City Hall. The divers can even get a glimpse of what the old mine used to look like – there are still some old mining equipment, train tracks, ore carts, shovels and steam-powered jackhammers underneath millions of gallons of crystal clear water. More than offering a one of a kind diving experience, Bonne Terre Mine dive tours ensures the welfare and safety of divers. Before diving into the abandoned mine, divers are required to demonstrate their diving skills before a team of professionals guides go with them on to the first of the 24 progressive dive tours that ranges from basic open water caverns to diving into cave-like tunnels. Though there are halogen lights to simulate an open water experience, subterranean diving is definitely not for all. Bonne Terre Mine is open on weekends, but you need to procure reservations for the guided tours. Because of the cold water (55 degrees all year round), artificial lights and cavern/cave-like environment, Bonne Terre is strictly for competent divers only. Máquinas marcadoras de rodillos para acabado de metales Máquinas para el estampado de metales