Yap Caverns

Yap Caverns is the island's most distinctive geological dive, a network of interconnected caverns and swim-throughs cut into the limestone reef structure along the southern coast. Light beams filter through cavern mouths at 10 to 18 metres, illuminating walls encrusted with orange and yellow cup corals, colonial tunicates, and sponges that thrive in the low-light interior. Nudibranchs are exceptionally diverse here with over 40 species recorded in the cavern system, and small groups of glassfish and cardinalfish shelter in the darker recesses. This is a cavern dive, not a full cave penetration, and is accessible to Open Water divers with a briefing.