What type of underwater cave is most extensive?

The most extensive type of underwater cave is solution caves. These caves are formed through the process of chemical weathering, primarily involving the dissolution of soluble rocks such as limestone, dolomite, and gypsum by acidic water. Over time, this process creates vast networks of passages and chambers, which can stretch for considerable distances underground.

Solution caves are characterized by their complex systems and often large volume, making them suitable for extensive exploration and diving activities. Their development depends on the presence of water that is enriched with carbon dioxide or organic acids, which increases its ability to dissolve rock. The combination of chemical processes and geological conditions conducive to their formation contributes to their vastness compared to other types of underwater caves, such as cave pools, rift caves, or sinkhole caves, which typically do not have the same scale or structural complexity.