Not that Irwin Allen could ever have done this, but it’s quite fascinating to watch this in the context of the currently circulating “Ocean” documentary from Sir David Attenborough looking at just how mankind has profoundly affected the pristine waters that are so clearly and colourfully illustrated in this feature. According to the commentary, mankind only obtained 3% of it’s total food from the sea at the start of the 1950s, and what we see clearly here is that the natural resources at least had some degree of a fighting chance against fishing fleets or industrial harvesters of minerals that couldn’t quite trawl the depths as and where they wanted, in all weathers and in unsustainable quantities. There’s an impressive array of underwater photography showing us the Technicolor beauty of the life below the waves. From colourful reefs to lively sea creatures, we see nature at it’s most uninhibited by man with plenty of activity going on. That ranges from the beautiful to the curious and from the violence of overhead storms to fish and plants swimming about. There’s also a duel between an octopus and a shark - and no guarantees who will win! There is perhaps a little too much by way of overly optimistic narration, but it’s still sometimes quite informative and doesn’t overwhelm us with endless statistics as it allows so much of the imagery to tell us the story and appreciate for ourselves. It is worth a watch, but could hardly be described as a documentary that advances or respects the complexities of the underwater ecosystem.