In what could be the largest natural gas discovery in history, Italian energy company Eni says it has unearthed a "supergiant" gas field in the Mediterranean Sea covering about 40 square miles.
The gas field could hold a potential of 30 trillion cubic feet of natural gas. Eni says that's the energy equivalent of about 5.5 billion barrels of oil. The company won't know the field's true size until it begins to develop it.
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