While transferring oil from a barge to an oil tanker a little after 6:30 a.m. this morning, oil spilled into the San Francisco Bay this morning, leaving a big sheen. (Ugh.)

According to SFGate, "There is a one-mile sheen on the bay coming from the tanker the Dubai Star and the barge, which are anchored about 2 1/2 miles south of the Bay Bridge, Coast Guard Petty Officer Erik Swanson said.

"We're not sure exactly what happened," Swanson told SFGate. "It's hard to determine how much oil is in the water because a little oil can spread over a large area of water, but this is bunker fuel, which is a little heavier."

The oil (bunker fuel) is the same kind of oil that spilled into the Bay during the infamous Cosco Busan spill of 2007, where somewhere around 50,000 gallons of fuel polluted the Bay, coastal areas, and wildlife.