So yesterday I took my new underwater camera base out to the Point Loma tidepools right around low tide ... and discovered that low tide isn't always low tide. It was a 1.7' low which turned out to be still high enough to cover all the tidepools with a pretty active swell. Putting my camera in that churning mess would have resulted in murky videos, assuming the camera didn't get washed out to sea.
While the effort was cinematically fruitless, it taught me this:
Because of the tide schedule, I'm about a week away from being able to use my new device.