You are able to see through the world if you create a 2x1x2 and fill the top of one side with water, then swim to the other side while sprinting.

All of the blocks used musn't be transparent, and there had to be a roof with the corners filled in. For the best effect, do it in a strip mine deep underground.

The texture pack is PureBDcraft, my FOV is 70, the textures are Fancy, and anti-aliasing is at 8.