when You under water and look up You will never ever see the clouds or a helicopter in the sky! Except in Arma3 Alpha or maybe in a swimming pool. :-)

the lightest wind will allways disturbe the water surface so the light will be shattered.

And please keep an eye on the so called TOTAL REFLECTION effect. Due to this physical behavior the surface appears like a mirror outside the specific angle.

I report this because of the TACTICAL influence! submerged divers should not spot landmarks or helicopters!!!