The variation from these blowholes was huge – here’s a waveform grab of a four minute sequence:

Having been there for a while you could predict how big each blast was going to be, by the height of the approaching wave…. And you will notice in the video, there was a sequence of big, bigger & really freaking BIG waves came crashing in and @0.42 just before the third blast, the camera does a bit of a lurch, as I momentarily feared for my life (or at least my recorders lives) and ducked down to get a good solid hold of my recorder bag, ready to run like hell! One of those moments I shall never forget….

Recorded at the Alofaaga Blow Holes, Taga, Savai’i, Samoa