BLUE CAVE OF BISEVO An ethereal glowing blue ocean cave in Croatia. The blue cave of Bisevo is not terribly easy to visit. First you must get yourself to the Croatian island of Vis, by ferry from the city of Split. Once there, travel by bus or motorbike to the other side of the island, the tiny fishing town of Komiza. There, hire a boat or tour to take you to the island of Bisevo, about an hour boat ride from Komiza.