'Sea Monsters: A Prehistoric Adventure', here a 40 minute short film rather than a series or feature length, could have worked. It should have worked as the potential was hardly small. The subject did sound very interesting, though not an expertise area of mine by any stretch (something that will either be fascinating for people or turn them off). As did the idea of mixing computer generated animation for the animals undergoing this adventure with the inclusion of live action human scenes.
Unfortunately, 'Sea Monsters: A Prehistoric Adventure' came over as a very uneven and disjointed documentary. Few of the individual elements are done awfully, but few of them are done exceptionally. When it comes to comparing the animals scenes and the live action ones, one of two is done very well indeed despite imperfections. The other however falls completely flat. So 'Sea Monsters: A Prehistoric Adventure' interests but also disappoints.
Am going to start with the good. Mostly 'Sea Monsters: A Prehistoric Adventure' looks good. It's beautifully shot, the scenery is even more eye catching (as ought underwater is both beautiful and uncompromising, showing its wonder or danger without trivialising or being too sugary) and most of the graphics impress, the CGI is fine. The animals themselves are incredible, whether prey or predator, cute or menacing, big or small their personalities really do shine.
The footage with them is compelling and has a wide range of emotions, the story was investable emotionally and involved. The narration is engaging and informative (did find myself learning a lot and wanting to research more), as well as well delivered. Not jokey or over-serious, neither does it over-explain or manipulate.
Not everything works sadly. While the production values are mostly impressive, it's not so good when close up. Close up the animals have a fake look, especially with the 3D which also struck me as overused and not necessary. The music agreed is ill fitting and never gels with the action, like it was lifted from something else and inserted in.
Where 'Sea Monsters: A Prehistoric Adventure' most falls down is in the live action scenes. They were pretty dull and just had little to them that was interesting or investable. And then there was the acting, the actors did not look as though they wanted to be there. Structurally, it felt very disjointed. The constant back and forth was distractingly jumpy and almost gimmicky. It would have been better if most of the documentary was the animals' journey and the live action scenes were bookended.
In summary, watchable but uneven. 5/10.