There was a precedent supporting the Europeans: American green laws insist that ships docking locally be double hulled, even though that forces ship owners to pay for unwanted double hulls on international waters en route to American ports.

ECONOMIST: Planes and pollution

In 2007 the people of Hawaii gave him a present of a double-hulled canoe, the Alingano Maisu.

ECONOMIST: Mau Piailug

In August 2007, I traveled to Greenland from Svalbard across the North Atlantic in a Russian double-hulled former spy vessel.

FORBES: It's Not Reality But Perception That Counts

The steel vessel is double-hulled and designed for drilling in Arctic waters.

CNN: Shell: Grounded drilling rig sound and fit to be towed

As much as 150, 000 gallons of ultra-low sulfur diesel and about 12, 000 gallons of other petroleum products are on board the Kulluk, a double-hulled steel vessel with a helicopter landing pad and tower in the middle designed for drilling in Arctic waters.

CNN: Alaska drilling rig towed to harbor off Kodiak Island