There are precious few caves where this happens. It's an anomaly found only in very shallow caves. I have yet to experience such a cave.
Note: A cave "can" not "does" There are a WIDE variety of diving situations -- possibly the writer took that into consideration as well??? I assume Florida has few caves with air, but I find caves such as The Bubble Cave and Sacred Cenotes so fascinating. I would rather visit them than dive down a 100+ feet into the abyss. Personal preference I assume.