A new type of drilling rig, such as the one ordered by BP Exploration Alaska to drill in the Liberty field in the Beaufort Sea off Alaska, nearly 2 miles deep and with offsets as long as 8 miles. BP will own the land-based rig and will use it to drill as many as six extended-reach wells into Liberty field beginning in 2010. One of the design requirements of the rig was the ability to drill wells out to 8.3 miles (43,824 ft).