This would once, geological eons ago, have been a tunnel through the rock from the outer sea, into Pirates Bay. The tunnel would over time have collapsed and has eroded so the waves flow though (just) at high tide. You can still walk over rocks to the island on the left. To the right is the ledge on which in the early 50s there used to be a steel rope attached to the rock wall by great bolts. The bolts are still there, but the ladder allowing you to get up to the ledge has been removed. In 1956 a honeymooning couple (and he was a surf lifesaver so presumably no slouch at swimming), got swept off this ledge by a wave, then pushed into the blowhole. The water was pounding into the blowhole and although rescuers could hear the young man calling for help, he also drowned. Locals go up onto the ledge to to fish. On this trip, from the cliffs overlooking the ledge and the entry to the blowhole, there was a swarm of jellyfish. From that height, they looked gorgeous, floating serenely with a gentle tide.