ScreenShots :

No voidfog nd no dimming (what you get with this mod) – matches 1.7.3 and 1.8.1 + no voidfog and 1.1 superflat

1.8 and beyond added void fog near bedrock level. This is not conducive to megabuilds that begin low. Fortunately there was a mod to remove it.

Unfortunately, 1.9 and beyond added a second effect when near bedrock: everything gets slightly darker. This mod removes both the fog and this second effect.

VanillaMinecraft version 1.1 removes the fog if you are in creative mod (but not the dimming ugh). It also removes the fog AND the dimming if you are on a flat map. Use this mod to remove both of them no matter what: in survival, non flat maps, whatever

See the images for an example of

1. no voidfog but with dimming (creative mode)
2. no voidfog and no dimming (this mod)

Installation instructions
to install, put the class file in your minecraft.jar.
and the usual: delete the files in the META-INF folder in minecraft,jar

This is for 1.1 final only.

Credit to : MamiyaOtaru from planetminecraft