Some great shots of some odd (alien) deep sea fish and a good tie into space exploration, but other than that, the 3D isn't that great and reaction shots go too long.

The experience is so immediate and immersive that you actually feel as if you are swimming with the krill.

There are impressive rock formations and many other fine things to see, along with an interesting science lesson.

It is a lot more like being there than just watching pictures taken by someone who was there.

Here we know only that Cameron and his bright-eyed young scientists (who take turns narrating) are heading to the deeper parts of the Atlantic and Pacific to observe the environment and life-forms down there.

Much of the allure of the film comes from Cameron's easygoing, rather unscientific approach to the project.

It presents complex ideas simply with amazing visuals to wow those from eight to eighty.

The first two-thirds of Aliens of the Deep offer a fascinating peek into earth's mysteries.

It is useful to be reminded every once in a while that there's a whole universe of things we don't know, and that their discovery is exciting.

Often thrilling.