If you check back to this thread, I've got some random questions for you.
I'm an avid recreational scuba diver, and have been fascinated by the few times I've actually come across a cephalopod underwater. But they're amazingly difficult for a novice to spot. I've even had difficulty pointing them out to other divers within an arm's length of them.
Do you have any advice for actually seeing one of these buggers, when they're trying their best to look like a hunk of coral? Keeping an eye out for midden is obviously useful, but still seems insufficient for one of my skill. Did your polarized lenses make it any easier to pick out a camouflaged octopus? Would yanking the IR filter off a digital camera result in them showing up differently in the viewscreen? Anything else, technological or otherwise, that might help?
Regardless, excellent posts on this article. Really fascinating stuff. You should really have some journal entries!