For folks used to watching the beautiful undersea imagery from the likes of the "Blue Planet" (2001) or it's 2017 sequel, this might seem a little bit unremarkable - but if you watch this documentary on this visionary man, you will soon realise that he and his "oceanic musketeers" were the source of so much of the basic building blocks upon which the latter programmes are based. From designing the "Aqualung" to pioneering waterproof cameras, this Frenchman comes across here as a forward thinking and inspirational figure. Of course he had flaws - much of what he did was funded by and produced for the oil industry, but this film serves to illustrate just how little even those closest to the ocean environment understood about human impact on that space, and gradually how his increasing awareness became the vehicle for a global attempt to profoundly change attitudes towards the seas. His life was not without it's struggles - personal and professional, and though the film does reflect those, it doesn't dwell on them: this is essentially an interesting and compelling story of a man well ahead of the curve. The photography is astonishing; not so much the beautiful underwater stuff, but of his early life - he clearly was a film maker long before anyone saw commercial returns from such ventures. It's let down a bit by the nature of the production. It uses a lot of out-of-vision commentaries and interviews which are sometimes quite hard to follow, and the contemporaneous chronology of the narrative means we don't really get any retrospective, objective, sense from his peers as to his achievements or his vision. Still, for many of us who remember his television series of the 1970s, thus film is an interesting reminder of our time on the "Calypso". A time that clearly demonstrates that pollution and climate change issues have been an high profile issue - and have fallen on many a deaf ear - for many, many years.