Toucan Dive brings lots of new divers to Bonne Terre Mine every year.  When you dive, there is always  several guides in the water that are going to take you on one of their many trails.  Trails start with beginner trails, and continue on to many advanced trails.  Prior to going on your first trail, they will require you to do a few skills such as partial flood of mask, regulator recovery, buoyancy, and alternate air source breathing with a buddy.  The great thing about  Bonne Terre Mine is that all of us are in very close proximity of a very special place!  There are those that travel all over from the states and Europe to dive this wonderful natural resource!  For us, it's only 6 hours away!  The best way to go, is to go with a dive shop or a buddy rather than solo, to have a great experience.  Hope this will help you!