You cannot see green in the true ocean, only the shallows, maybe Sargasso See due to swirled surface collections of plant/algae, just as much as you see red/brown/blackish in the Red Tide accumulations off West Africa,Florida's coasts, etc. The true ocean color, as seen in daylight shadows of cliffs and mountains is dusky opulescent grey due to suspended organisms and detritis.
NASA points this out in lectures and publications often. If filtered in an...

You cannot see green in the true ocean, only the shallows, maybe Sargasso See due to swirled surface collections of plant/algae, just as much as you see red/brown/blackish in the Red Tide accumulations off West Africa,Florida's coasts, etc. The true ocean color, as seen in daylight shadows of cliffs and mountains is dusky opulescent grey due to suspended organisms and detritis.
NASA points this out in lectures and publications often. If filtered in an area, its clarity would make it clear translucent deep grey or black without any absorptive/reflective particles suspended to send back light from a ray of sun
or artificial over the depths.Just like shining a flashlight thru clear moonless midnight skt into the heavens and seeing no end for the beam. Over the shallows you may see what color the bottom gives effect to, with perception of depth difficult to ascertain.
Sorry its a dull non-technicolor world of water, but after all, it was created before the 1930's, so everything was black, grey and white then.
Acoording to the philosophy of Calvin's father of "Calvin and Hobbes" fame
pictures of our grandparents and earlier relatives as well as 1920's movies and photos in old albums were all done with color capable film.Its technology was always available even before then. It was just that the world and everything in it never had any color to be picked up by the cameras. Back then philosophies and facts were much simpler, everything was black & white.
Then, one day in the early middle of the 1900s, suddenly everyone and God only knows decided to try something different, after all, we had abilities in cameres and films we weren't using going to waste, and ouala'-the world and people became instant technicolor.That explains family albums and Hollywood archivs quite well.