long spined sea urchin diadema setosum hiden in the sandy seabed and bright green sponge near coral reef. dangerous underwater

animal beautiful beauty black clear closeup coral danger dangerous diadema dive egypt environment exotic fauna hide hiden long macro marine natural nature ocean poison poisoned red reef rock saltwater sand scuba sea seabed snorkeling spike spined sponge summer swim texture textured thorn tropical underwater urchin water wild wildlife