Volcano is a shallow Loutra dive site built around volcanic gas bubbles rising from the seabed, with a strange rocky bottom that feels more geologic than reef-like. It is a short local session rather than a big offshore run, and the shallow profile makes it approachable for newer divers and snorkelers. The attraction is the otherworldly landscape and the life that clusters around it, not coral cover or depth. On rougher days, surface comfort matters more than the underwater route.