One of my many dive trips was to the Cooper River in South Carolina about 15 years ago. It was quite disorienting -- the clay bottom we were searching was only about 20' deep, but the water was so murky that when you got about half way down you couldn't see the sun anymore. You had to watch your bubbles to figure out which way was up! It was basically like diving in
that was infested with alligators and bull sharks. I somehow even managed to convince my (future) wife to come with!
She found a complete Meg tooth. It was on the small side but the enamel and serrations were mostly intact -- still razor sharp! We also found lots of Meg tooth fragments as well as great white, mako and other shark teeth. And other fossils like dolphin vertebrae, pieces of whale rib bones, and some lead remnants from Civil War-era
shot towers.
Not surprisingly, it was a very memorable experience!