Not that I wasn't satisfied with it as it was. Believe what the author tells you - this book plays like an underwater Blade Runner. It's glum. There's no hope. Everything's dank and dreary and there's not one character you'd like to have as a close friend. I like that in a book - feels real, like a dysfunctional crew on an off-shore oil platform (at least they're not unionized, that would be worse).
Anyway, the best thing about this book is the science, particularly the author's in-depth speculation on "how to get a human to live several miles under water". Everyone's seen the Abyss. I'm sure the author was chuckling watching Bud Brigman descend the fathoms and still survive, even with that transluscent pink oxygenated flurocarbon swill in his lungs. That scene may have been the author's impetus. Or maybe Deep Star Six.
The pyranosal RNA thing, however....not too keen on that. Seems like the author was looking for an excuse to keep the deep-sea-ers down there, and the author pulled that from his nether regions. Doesn't matter.
Anyway - I wander. Great book. Good writing. Accurate science (I'm a biochemist). Compelling and scary characters. And there will be a sequel. There has to be. I look forward to it.