Castello Aragonese

Castello Aragonese is Ischia's most iconic dive, set beneath the dramatic medieval fortress that rises from the sea on the island's eastern tip. Underwater, volcanic rock formations create walls covered in yellow encrusting anemones, with a unique CO2 vent system that has made this site internationally famous for ocean acidification research. The bubbling fumaroles create an eerie, otherworldly atmosphere as divers explore rocky corridors teeming with Mediterranean fish. An unforgettable dive combining history, geology, and marine science in one remarkable location.