Oceanographic Data collected during the Bermuda: Search for Deep Water Caves expedition on the RV Endurance in the North Atlantic Ocean between September 5, 2009 - September 30, 2009 (NCEI Accession 0111205)

More than 150 limestone caves are known to exist in or near the island of Bermuda. Many of these caves have extensive but relatively shallow submerged portions that connect to the sea via tidal springs along the coastline.

These inland caves are inhabited by a number of diverse eyeless and colorless crustaceans and other invertebrates. Many of these organisms are "living fossils"; and some are most closely related to deep-sea organisms. While previous investigations of marine caves have been limited to those within shallow depths (less than 50 meters/164 feet), current research suggests that caves can occur at almost any depth within the sea.