"Twin Caves" is actually a dive site featuring two chimney caverns on a reef wall. Divers begin their descent through one chimney to the bottom of the wall. Overhangs, lava tubes, and lava fingers are abundant in the area around the first chimney. White tip reef sharks can frequently be seen hanging out around one of these formations. Divers then proceed along that wall to the second chimney. The vertical wall is completely encrusted with hard corals, tropical fish and invertebrate sea life. After rising through the second chimney, divers then swim along the top of the reef finishing a perfect multi-level dive back at the boat.