 As the marine CNG transport is economical for medium distance transport and has fast unloading flexibility at many ports without costly unloading facilities, they have become alternate solution to submarine gas pipelines.Natural gas/methane can also be converted cheaply in to hydrogen gas and carbon black without emitting any green house gas for use in transport sector with fuel cell vehicle technology.The state-owned Oil and Natural Gas Corporation (ONGC) acquired shares in oil fields in countries like Sudan, Syria, Iran, and Nigeria – investments that have led to diplomatic tensions with the United States.