Surge channels are basically a eroded fault.
All rocks have cracks or faults in them. Expose them to pounding water & the fault will begin to erode like a cavity! After a few thousand years this cavity will get bigger to produce a surge channel.
I have seen a aerial shot of this spot & can physically see the fault running right across the point! This channel will eventually cut right through making the rock on the left a island.
I know of at least two people who have fallen into this surge channel & died! It’s a very dangerous place! I am always careful when walking above!
Even before I arrived I knew the Blow Hole wasn’t going off very large! While I’m hiking in,If I can hear the “booms”,I know it’s going! I didn’t hear anything & already knew before I arrived that it was small at best! I think the tide was too high plus the swell/wave size was too small as well.
Trying to nail this monster down is a science!