It's a little hard to tell, but if you look closely, you'll realize that that's Maria Hunter and Sally down in the water. They're in a formation known as the "toilet bowl". It is a crevice that has been blocked by a rock fall such that big waves come flying down a channel, work there way under the rock and fill up this basin. Then as the wave departs the basin drains out, much like a toilet flushing. You jump/slip in while it's full. It drains until you're standing at the bottom of an 8 foot hole in knee deep water. Then the next wave comes and lifts you all the way up to the rim. If you're fast, you can climb out while the water the basin is full. Look at the next few pictures, and you'll get the idea.