Comfortable diving that enhances the heat retention effect with a layer of air without getting your body wet ♪ A dry suit is necessary if you are going to dive in Izu from autumn to spring. Special prices are offered during the winter months. Do you want to be able to dive at any time of the year on this occasion? You can actually see the state of the sea with the four seasons! The sea in winter has few microbes and is stable and highly transparent. In the cold but clear water, you can see deep-sea fish such as monkfish and nudibranches, which are said to be jewels of the sea!