A 4-minute RIB ride from the center of Šimuni takes you the Mandre site. A wall begins to tumble down at a depth of 21 to 44 meters. The walls are home to numerous animals, such as eels, octopuses, and small sea-snails, and during spring and early summer you can see small-spotted catshark eggs. A large crack in the wall serves a genuine undersea home for brown meagres.