A close-up of the base of coral polyps! A hard…

A close-up of the base of coral polyps! A hard protective limestone skeleton called a calicle which forms the structure of coral reefs. #elnido #palawan #scuba #diving #divingmagazine #amazing #underwater #photography #underwaterpics #coral #reef #explore #experience #discover #nature #ocean #paradise #philippines #instapic #instagood #instalike #picoftheday #itsmorefuninthephilippines (at Palawan Divers – El Nido)