This is a recording of the last tide of the day, coming in under Achiltibuie Pier on a summer evening in North West Scotland on 6th August 2008. The recording is very quiet as the weather conditions were sunny and calm; however there is a slight electrical noise that I was not aware of at the time of the recording, which is common-made electro-magnetic interference for which the hydrophone needs to be balanced.

In October last year I made my first audio recording of the Firth of Forth from a diving rib that was around 500-600 metres away from the main deep shipping channel. My hydrophone was at approximately 20 metres in depth and highlights that the attenuation of sound through water is extremely efficient. As I was making the recording, a large tanker appeared further up the estuary a couple of miles away, the noise of its engines slowly increasing until it was quite overpoweringly noisy.