Welcome to the forums! I'm in Knoxville and there are 2 quarries for diving between Knoxville and Chattanooga: Philadelphia Quarry (in Philadelphia, TN) and Loch Low Minn (in Athens, TN). I tend to prefer Philadelphia Quarry, and they have reasonable rental prices should you need to rent tanks or other gear (they have it all there, including wetsuits).
Quarries are definitely not the Caribbean, but they are helpful for those of us not near the coast in getting more comfortable in the water and improving buoyancy and air consumption, practicing with DSMBs, etc.
Have fun in PCB. The viz there is usually not nearly as good as the Bahamas, but if you can get past the viz there can be good things to see, both small and big (such as Goliath Groupers).