Scuba Trip 2015: Bonne Terre Mines

June 26, 2015 – June 28, 2015

What’s Bonne Terre Mines?

Bonne Terre Mines is one of the largest man-made caves in the United States. They were once the world’s leading producer of iron ore, but closed in 1961. While closed, the pumps that kept these caves dry were shut down, which allowed the caves to quickly fill up with water near the uppermost layer. The mines were purchased in 1980, and opened for diving a year later. Since then, this spot has become one of the more unique dive destinations in the world.

The dive conditions here are independent of the weather outside the caves. Inside you will experience an air temperature of 62 degrees fahrenheit, and the water stays a cool 58 degrees fahrenheit. It’s recommended to dive in a heavy wetsuit or drysuit. The dives are conducted in 40-60 foot depths with about 100 foot visibility. One thing to remember is that you are diving inside a cave, and even though these caves are lit by 500,000 watts, this is comparable to a night and/or dusk dive.


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Come join the country’s only not-for-profit, full-service scuba company on a dive trip to Bonne Terre Mines

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Bonne Terre Camping and Diving

  • 3 days and 2 nights of camping
  • 2-tank day of diving with Treasure Hunt
  • Tanks, air, BCDs and regulators (if needed)
  • Campsite meals