The Langeled Pipeline is the longest underwater pipeline, measuring 746 miles (1,200 km) long from Norway to the U.K. Costing 10 million USD to develop.
It was constructed for Norwegian Hydro to carry 70 million cubic yards (45 million m3) of gas to heat homes in the United Kingdom. The Langeled project will provide 20 percent of overall gas supple to United Kingdom. Lead by... Ormen Lange, the project was completed in 2006; nine years after Norwegian Hydro first discovered an oil field 2,953 feet (900 m) below the earth’s surface in the sea. A total of 3,000 workers involved in the construction of this pipeline under the sea using special equipment.