We offer you masks, snorkels and fins to all sizes to swim with safety inside the big cave where seals born their babies in winter in Dasia island. In summer there are no seals inside because there is noise of the boats. All the seals are going to Alonisos island where there is a protective sea park for the animals. We give you all the Information you need about how to swim inside or we smim with you. Don’t miss this special experience.