A major gas field, named Taglu Gas Field, was discovered in the Mackenzie River delta in 1971, followed by the Parson Lake field and Niglintgak field. The estimated gas reserves of these fields are , and , respectively. Moreover, further into the sea from the Mackenzie delta lies the Amauligak field. This, the largest known oil deposit of the Beaufort Sea, was discovered in 1984, and is estimated to contain of oil and of gas. The development of these fields is hindered by their remote location. This problem was alleviated for Prudhoe Bay by constructing the Trans-Alaska Pipeline, but is limiting regular commercial production at Mackenzie River deposits. For example, the Amauligak Project was started soon after the discovery of the field. In September 1985, the tanker "Gulf Beaufort" has transported of crude oil to Japan, which was the first shipment of oil from the Arctic deposits. However, the project has stalled after that.