North Florida Springs

There are no boats here and no dive schedule. You drive to the spring, pay at the gate, park as close to the water as the property allows and carry gear down steps or a boardwalk to a platform or the run itself. Days are self-directed: kit up, dive, walk back, swap tanks out of the car, go again. Some properties allow camping on site, and the shops in High Springs and Branford handle fills, sorb, rental sidemount rigs and guides, which is why divers base in those towns rather than commute.

The systems are cut into limestone, and the water reaching the surface has already travelled through it. That gives each site a character: a collapsed basin you drop into and circle, a spring run with steady outflow you swim against going in and ride coming back, or a siphon where the water pulls the other way and the workload reverses. Flow strength is the main thing separating one entrance from another, and at the strongest openings it dictates the whole dive plan.

The draw is light and clarity in an overhead environment. In the open basins the sun comes down through the hole in the rock and lights the floor, which is why so much training and photography happens there. Clarity is not a given, though: after heavy summer rain the rivers can push tannic water back into the systems they drain, and exhaust bubbles collecting on the ceiling bring silt down behind a team. Thermal cover is planned around dive length rather than the month, so a drysuit or a thick wetsuit is normal in August as in January.

This is a training destination first. Cavern and cave courses run all year and many divers arrive with a course booked rather than a holiday planned, then return to build hours in systems they already know. Open-water divers are not shut out, since the sinkhole basins are divable on a standard card and give a first look at what the training leads towards. What the springs do not offer is scenery in the ocean sense; the interest is rock, water and technique.