A World War II shipwreck is slowly leaking oil off the South Shore of Long Island, according to the U.S. Coast Guard.

Video taken less than two weeks ago shows oil that officials say has been sitting at the bottom of the ocean since World War II.

The Coast Guard says the sheen is coming from a pinhole leak on the British tanker Coimbra.

On Jan. 15, 1942, the vessel was torpedoed by a German U-boat 30 miles southeast of the Shinnecock Inlet, killing 36 of the 46 people on board.

The Coimbra was loaded with 2.7 million gallons of lubricating oil and heading to Halifax, Nova Scotia, Canada, when it sank.

Petroleum can still be seen bubbling from the wreck 180 feet underwater.

Authorities say they've found oil in at least eight of the ship's tanks, although they're unsure exactly how much remains.

"In my opinion, it looked a bit more than we thought we'd find," says Aaron Jozef, of Resolve Marine Group.

But officials say the oil is leaking slowly and dissipating just as fast, meaning there are five to 10 gallons in the water at any given time -- too little to wash ashore.

Once an assessment is finished, experts say they'll pump out the petroleum.

The Coast Guard asks boaters to stay at least 500 yards from the wreck during the cleanup operation.

There are no plans to lift the ship from its watery grave.