The legend of Odysseus is now attributed to the island of Malta, and not Mljet, probably due to their similar names. The cave is a few tens of meters wide. There is the collapsed vault and the bottom is covered with sea water. The cave can be entered by the sea, swimming or by smaller boat, because the entrance is about 4-5 meters wide. Tunnel cave is about 20 meters long, and the depth of the sea is about 10 meters.
You can come to the Odysseus Cave by land, but you have to use very steep stairs. If you find yourself on the island of Mljet in the summer, you should go to the cave around noon because then the sunlight creates a spectrum of colours in the sea. Photographers will love this natural phenomenon. Research shows that Mediterranean monk seal used to stay in this cave.
