Yes, the work they're doing is mind-boggling and important, but sometimes the images alone are more than capable of speaking for themselves.

That IMAX 3-D cameras have plunged so deep to record an often bizarre array of sea creatures undoubtedly delivers a certain 'wow' factor, but the accompanying commentary is heavier on breathless excitement than solid fact.

The final shot, in particular, is awesome, and confirms that the sooner Cameron gets back to making proper movies, instead of Boys' Own diversions, the better.

Docu about underwater creatures has stunning visuals.