Just musing on the math related to 20,000 containers. To unload the ship without the automated, high-speed overhead gantry cranes and no rail cars to load them onto - figure you could maybe get one container off every 15 minutes? That's nearly 7 months to unload.... Yikes.
they don't have to unload everything, but it seems like moving it will involve some combination of reducing the weight by off loading some combination of fuel/ballast water/containers, digging/dredging around the bow and stern, plus doing the move at high tide.