I had this idea to attach our GoPro cameras to a Scripps OBS that was being deployed on the shelf nearer the coast. These underwater housings are rated to 100 feet and we deployed them on three different sites at that depth, recording some of the coolest OBS video I have ever seen. The stills captured from the video are pretty cool too, but one of the unexpectedly groovy features of the video is the audio. You can hear the acoustic responses, ship noise in the shallow, ocean background biology, and current noise on the seafloor.
Time series of deployment and recovery. Photo Credit: Ernie Aaron.