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anellid background biology blue bottom cave cephalopod decapod diving entrance eyes fish flabellina flying friends helmet hunter hunting hyperventilation image industries invertebrate landscape macro marine mediterranean mollusc monster muddy nautilus navigation net night nmollusk noctopus oceanic octopus opistobranco orange photographed photography portrait railway red reflexes safety sandy scuba sea seabed shellfish shrimp siphon sky snorkeling spallanzani spiral spirograph sponge stainless stars sulphurous surface swimming thrush tiger trapped tuft underwater vegetation village volcanic whit yard yellow