I read this many years ago, and liked it so much I kept it on my bookshelf thinking I'd read it again. I just did, and while I didn't love it as much as I remembered, it was still quite good. In fairness, I may be inflating my rating based its nostalgia factor, as the supporting casts' whining and moralizing got tiresome, but I still found the story to be enthralling. If I was about to die from lung cancer, I'd also be willing to undergo radical, experimental surgery to give me gills. I think I'd ask them to do their experiments with me in warmer, perhaps tropical waters. Escaping into the cold California Pacific, while interesting in a novel, wouldn't be nearly as fun in real life as, say, the Florida Keys. :)