At first, I panicked. Which was appropriate, I think, given that I was underwater and suddenly unable to move. I was just off Santa Catalina Island, diving from the back of a friend’s express cruiser after zipping over to Avalon Bay from Los Angeles that morning. We were in the giant kelp forests, and I was in a trance watching the way the stories-tall “trees” swayed with the pull and push of the water. I had seen massive sea fans in the Caribbean and giant sequoia trees in the Pacific Northwest, but never this sort of mashup of the two, with sunlight peeking through to create a kind of stained-glass underwater scene, all in blues and greens.