If we ever did succeed in 'cleansing' the ocean of all of its germs (either by a deliberate Mikrobefrei Aktion or simply by continuing our limitless consumption of most of the world's resources) the atmosphere would fairly quickly lose half of its oxygen and humanity would rapidly die out.
This fact still isn't widely known by laypeople today - nor was it known by many scientists back in 1940.
I mention this only because the world in 1940 was as consumed with killing off all the germs in general, including those found in sea water, as the Nazis were about killing of all the Jewish 'germs' in particular.
The civilized world in 1940 widely supported the effort to greatly reduce biological diversity by ridding the world of all kinds of "pests", an idea that spilled over into the minds of the ordinary Nazi (and their ordinary/silent tolerators) when thinking about a possible solution for the 'problem' of the Jews.
Among the most annoying pests in 1940 was household mold - particularly the blue green penicillium slime found on fruit, leather goods and basement walls.
It seemed clear - in early 1940 - that the penicillium slime "would not be missed", to recall the words of the Lord High Executioner.
But by late 1944, it all wasn't at all so clear that the penicillium won't be missed.
During the Enlightenment Project, we assumed that via reductionism we would actually eventually fully know Nature and upon knowing it, evaluate its worth, bit by bit.
What bits to keep and what bits to dispose of.