As much as I appreciate seeing video of rare and unusual creatures, the films coming from the Japanese marine biologists come with a high price tag.
Earlier, they captured a giant squid on a hook and we got to see a giant squid in action just before it died.
In the last few weeks, scientists have moved a frilled shark and a goblin shark to aquarium tanks, where they subsequently died. Quite quickly, too.
In both cases we do get to see video of creatures that live in a world alien to ours, true; and the videos are wonderful to see. At the same time, though, I find this particular study methodology to be a bit hard on the studied.