Talk:Quarry/@comment-83.86.168.221-20121006142716

If you want to have a large amount obsidian make a quarry in the nether. Make ice cubes, place and break them over a 30x30 area of lava. The effective depth of the lava "ocean" appears to be be only 2 to 3 blocks, then it hits netherrack. So the shape of the quarry got to be wide and shallow.