At least six of the drilling projects that have been given waivers in the past four weeks are for waters that are deeper — and therefore more difficult and dangerous — than where Deepwater Horizon was operating. While that rig, which was drilling at a depth just shy of 5,000 feet, was classified as a deep-water operation, many of the wells in the six projects are classified as “ultra” deep water, including four new wells at over 9,100 feet.
http://www.nytimes.com/2010/05/24/us/24moratorium.html?adxnnl=1&adxnnlx=1274670036-CxFkjWV5deuotCGTjCHf7Q