Certain places seriously amaze with the quantity of polychaetes dwelling upon each other. More then 15 of them can be found on the picture, besides Serpula vermicularis red tubeworm with a rose funnel, two Microcosmus monoascidia and, the most interesting, bivalve Arca noe mollusc with tangerine Crambe crambe coat all over it's shell (in the right lower corner).