This Arctic field, located on a peninsula jutting out into the Kara Sea, is estimated to hold 173 trillion cubic feet of gas -- twice what's thought to be in the United States' Marcellus Shale.
Infrastructure is always a challenge in a remote region. Gazprom had to build a 355-mile railroad to haul in construction supplies, and an even longer pipeline to get the gas out. The gas will be fed into Russia's vast pipeline system.
Source: Gazprom, Wood Mackenzie Cost estimates for oil and gas projects are from the energy consultants Wood Mackenzie. They include possible future costs and other data which may not correspond to company esitmates.