Cavefish
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Cavefish or cave fish is a generic term for fresh and brackish water fish adapted to life in caves and other underground habitats. Related terms are subterranean fish, troglomorphic fish, troglobitic fish, stygobitic fish, phreatic fish, and hypogean fish.
Phreatichthys andruzzii showing the pale colour and lack of eyes typical of cavefish. The large red spot on the head is the blood-filled gills, visible through the semi-transparent gill cover
As typical of cavefish, Typhleotris madagascariensis is an opportunistic feeder on various invertebrates
The waterfall climbing cavefish has several adaptions that allow it to climb and "walk" in a tetrapod-like fashion
The Mexican blind brotula and other cave-dwelling brotulas are among the few species that live in anchialine habitats
Subterranean river
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A subterranean river is a river or watercourse that runs wholly or partly beneath the ground, one where the riverbed does not represent the surface of the Earth. It is distinct from an aquifer, which may flow like a river but is contained within a permeable layer of rock or other unconsolidated materials. A river flowing below ground level in an open gorge is not classed as subterranean.
A subterranean river in the Cross Cave system of Slovenia. (Scale shown by people in photograph.)
The cave of source of the Buna can be entered by boat and dived through a cave system serving as an effluence of the Zalomka.
The Puerto Princesa cave can be entered by boat.
Devil's Throat Cave subterranean river from above