Off the coast of Rio de Janeiro — below a mile of water and two miles of shifting rock, sand and salt — is an ultradeep sea of oil that could turn Brazil into the world’s fourth-largest oil producer, behind Russia, Saudi Arabia and the United States.

The country’s state-controlled oil company, Petrobras, expects to pump 4.9 million barrels a day from the country’s oil fields by 2020, with 40 percent of that coming from the seabed. One and a half million barrels will be bound for export markets.

The United States wants it, but China is getting it.

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