Diving in cave(rn)s includes diving at depths and lengths of up to 40 m, but up to the point where divers can see. The entrance should be clearly visible and accessible at all times. Cavern diving is attractive in regions where there are small but interesting cave(rn)s that are not too deep or too demanding.

There are over 116 registered and documented diving sites, including antique sailing vessels and fields of coral growing on sheer undersea walls, caves and warship wrecks, now inhabited by schools of fish.