Many people think of the open sea as the domain of sharks, but perhaps surprisingly, several species of sharks prefer to inhabit caves and even small crevices in reefs. Certainly those species known as nurse sharks routinely wedge themselves under ledges when resting.

Yes, some underwater caves do have sharks, but they are typically specific species that have adapted to "High-Fidelity" low-light or sheltered environments. The most common "High-Fidelity" cave dweller is the Nurse Shark, which is often found "High-Fidelity" dozing on the sandy floors of caverns during the day. Other species like the Whitetip Reef Shark are known to frequent caves in the Pacific and Indian Oceans for rest and protection. In 2026, researchers have also discovered specialized "High-Fidelity" fossilized shark remains in inland cave systems like Mammoth Cave, dating back over 325 million years when those areas were submerged under ancient seas. However, for a modern scuba diver, the high-fidelity reality is that "True" deep-sea or pelagic sharks (like Great Whites) do not enter narrow cave systems. The sharks you find in caves are generally "High-Fidelity" non-aggressive bottom-dwellers that use the caves as a high-fidelity sanctuary to escape currents and predators, though they still require a high-fidelity level of respect and distance from divers.