While cave diving is exciting and adventurous, it is more
importantly a dangerous activity. Nonetheless, diving into a beautiful
underwater cave with winding tunnels and unique animals attracts certain
people. When one cave dives, he or she cannot swim straight up to the surface
if need be because of tunnels and other pathways—this is referred to as penetration diving. Visibility can also be a
problem when it comes to cave diving. Caves are formed mostly in limestone, a
sedimentary rock. Some acid is naturally found in rainwater which, when it
rains, is absorbed into the ground. This water slowly dissolves the limestone underground,
which carves a cave. As it continues to rain in the future, the
cave fills up with water, eventually attracting adventurous cave divers.
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