The system "was successfully reinstalled" on the Deepwater Horizon's failed blow-out preventer at about 6:30 pm central daylight time on Wednesday, the company said.
Earlier that day, it went offline after a collision involving a robotic submarine, resulting in uncontrolled gushing of oil and gas for about 10 hours.
The cap had been collecting up to 25,000 barrels of oil a day from the ruptured underwater well. On Tuesday, before the collision occurred, BP had contained more than 26,000 barrels of oil. The accident disrupted this progress, sending gas through the vent and interfering with its ability to prevent ice crystals from forming inside the cap.
Ice crystals had previously hindered BP from containing the spill, including its large containment dome efforts.
While the company attempted to solve the problems Wednesday, a second pipe was still in operation, siphoning oil off to a ship on the surface of the sea to be burned.
The U.S. government is currently proposing an idea for pipelines to be extended from the leaking well to production platforms in the Gulf amid worries of a more severe, hurricane-induced shutdown of the cap operation.
-- Reported by Andrea Tse in New York
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