In SLR photography, what mode should be used to make the ordinary sea look as blue as the sea water in the Maldives? I mean normal sea water

If the sea water itself is relatively blue, but it is not photographed, it means that your shooting angle or light angle is wrong, or the exposure is inappropriate. Change the shooting angle or shooting time, and then perform multiple exposures Then determine the accurate exposure parameters.

If the sea water itself is not too blue, then accurately expose it according to other scenery, and then process the sea water into the color you need later, no matter how blue it is. This is more troublesome. It is best to make the sea water appear in a relatively concentrated place in the picture, which will be easier to deal with later. Of course, what is fake is fake, but of course it is not as good as the real thing. A bad filter will turn everything blue.