The world’s largest container ship, the CMA CGM Marco Polo, is on a Trans-Pacific visit to Europe. Aboard the ship are 4,000 containers carrying goods destined for businesses and shops in time for Christmas. The ship is actually severely under-loaded. At its full capacity the CMA CGM Marco Polo could carry a staggering 16,000 containers, but the ship would have been unable to navigate the waters of the Elbe River between the North Sea and Europe's second largest port in Hamburg, which are too shallow for the latest generation of super container ships.