The Secret Cave is one of the several caves in the Abyss in Endless Ocean. It contains a pod of Risso's dolphins by day, and the occasional Common Fangtooth by night. Snailfish can be seen here day and night. Firefly squid can be found in zoom spots. This cave has two entrances, one of which is near the giant fossil embedded in the wall, at coordinates F-6 and at a depth of roughly 425 feet (130 meters). The other entrance, at a depth of about 390 feet (120 meters), is right between coordinates G-6 and H-6.