The healthiest reefs on the planet are those which also have a good population of sharks, a sure sign of plenty of prey fish species and also of food for the prey species to eat. Lol, don't worry, it's highly unlikely sharks will be invading Dublin any time soon. They get an undeserved bad rap from TV producers on "Shark Week" who know viewers love to be scared out of their wits, that's also why Dracula & Frankenstein movies are so popular. As a diver for nearly 50 years and having dived all over the world and encountered sharks many times, I can vouch for the fact that they aren't waiting at the stern of every boat waiting for "lunch" to jump in and satisfy their appetites. Swimming or snorkelling at the surface leaves one most vulnerable if a shark decides to investigate you, scuba diving however makes them think you're just another large marine creature, albeit a strange, bubble-blowing one and I have plenty of underwater video proving that, and sharks haven't survived for millions of years by picking a fight with every strange creature they encounter. I've dived with all the so-called man-eaters, Tiger, Great White, Bull, Oceanic White-Tip and Great Hammerhead. Great white the only one with a cage between us since they were in feeding mode on the look out for elephant seals, so not a good idea to risk it outside the cage. Before covid-19 struck I dived in the Bahamas last January with Tiger & Great Hammerheads only two metres away, no problem. They were more interested in the dive leader who was hand-feeding them lumps of fish, much more tasty than skinny, boney humans, though as I said in post #49, I would've liked to have used my Mavic to shoot aerial shots from the boat's stern of the action since it was in less than 30 feet of crystal clear water and many, many sharks at the stern at the end of a day's diving to be fed fish scraps of what was left, but leave a deposit of $500 with Bahamian customs? No thank you. Had to make do with hand-held video from the vessel's top deck instead. I've not been back to the Philippines since 2017, before buying my Mavic and would love to return to dive and drone to shoot some of the spectacular scenery above & below water. When you do get back to the Philippines after the pandemic, if you've a mind to, go to Oslob, Cebu and snorkel with the harmless whale sharks while they're fed with sprats by locals from pangas. A "nice little earner" for the local people!