Chris,you are probably right about that not being a cavern dive at that point you described,but sometimes in the effort to fight flow and keeping our head down while we barrel straight ahead,we can enter the over head and not realize it. Most people enter Manatee at Catfish hotel because of the strong flow at this point,but there is a secret to entering the cave/cavern from the head spring which takes you out of the flow. Good luck on a class.