Contracted divers for Houston-based Plains All American Pipeline began assessing damage to a ruptured Gulf of Mexico oil pipeline Sunday after the U.S. Coast Guard sealed the break. The rupture, first denoted by a drop in pipeline pressure on Christmas Eve, occurred about 30 miles southeast of Galveston. The leak has spilled an estimated 44,500 gallons of medium crude oil, according to a Coast Guard press release. Plains Pipeline will review it's operational records to determine whether the Coast Guard's spill amount estimate is accurate, company spokesman Jordan Janak said. None of the oil has washed ashore, and weather conditions are dispersing the spill and nudging the leftover sheen away from the coast, the Coast Guard press release states.