The bubbles cascading past your mask at that depth sound like glass beads clinking together. My friend and I just got back from San Carlos Mexico where we just completed our open water scuba certifications. I posted pics and two videos. The night dive and swimming with sea lions were the two highlights for me. A couple things that would have been good to know in hindsight for anyone who’s considering doing it:
If you’re in AZ and thinking about learning to dive, I highly recommend the good folks at Ocean Planet SCUBA– they were extremely knowledgeable in the water and fun people to hang out with on the surface.