According to mythology, Nisyros was created by the God of the sea Poseidon by throwing a piece of Kos island on him.
Nisyros, as an active volcano offers a lot of opportunities for diving in diverse diving locations which differ from one another as every divesite is unique. There is a world class dive in the deep canyon which is actually a fault line created by earthquakes. There is a reef that emmits gasses from within the rocks with a lot of marine biodiversity. Another bubbly divesite is a flat sandy bottom with a lot of gasses in a large area that makes you feel like swimming in champagne! For more experienced divers there are deep dives on reefs that have impressive visibility around 40 meters and unique underwater landscape!
April to December but the best season is August to November when there are more fish and the sea is warmer. Especially in September when the island is less crouded than August
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