In a through cave a Clathrina clathrus porifera belonging to the order of calcareous sponges has fluoresced. That could be established by the courtesy of Professor Dr. Guspav Paulay, the curator of Marine Malacology and adjunct associate professor of Zoology in the Museum of Natural History of University of Florida, Professor Dr. Gert Wörheide of the Lugwig-Maximilians-Universität of München and European-Marine-Life.org expert team.