Bonne Terre Mine is among the best in local diving. Just went back during the winter to get my gills wet again.
One of the great things about diving "The Mine" is that the weather is never an issue. No matter how bad it is outside, it'll always be 65 degree air, 58 degree water inside. The water is always calm and very clear, since you are diving in spring water. It's a great winter destination for much of the US.
For those of you who have been before, my main advice is stick with it! It gets more and more interesting every time. The trails get more challenging and there is a lot to see. Even in the parts that you have been to before, you'll notice things that you didn't see before.
On my most recent trip, our group visited "the city," an underwater time capsule of mining history. The city has multiple buildings including shops, offices, mule stables, and various furniture, such as desks that you can play with the drawers and contents.
The staff is really great and very professional, and very concerned about diver safety. Based on other reviews, some may consider this excessive, but it is reassuring when you are deep in overhead environments. As I've dove there more, the routines are very familiar, and I'm able to just relax and dive.
I have found that the mine has really grown on me. The main advice I can give is to keep coming back! The experience keeps getting better. Additional advice, like with any dive, is to be prepared. Plan for this like you would a boat dive. If you're on a boat and you have equipment problems, you'll miss the dive. It's similar in the mine. Use equipment you're familiar with. This is not a place you want to be trying out new gear.
The Mine is a truly unique dive site and worthy of adding to your bucket list.
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