Make a hole in the side of a tube

 From:  bb (BIRDBRAIN)
3194.1 
Can anyone tell me how to make a hole in the side of a tube?
The tube is 3ft long and 6" dia, it has a wall thickness of 1/2".
The hole is 2" dia. and 1ft from the end of the tube, on the center line.
The hole does not go right through, it only goes through on surface.