Originally Posted by BMWFREAK

The grain will be there no matter what, unless you have some sort of other light source which obviously the photographer didn't have.

When you take a picture with a high ISO, which is what he did and it was due to the fact that there was no light, the shutter speed slows down and so does the apeture. In doing this you are allowing a lot of noise which translates into the graininess that you see on the picture.