Business is booming at Europe's largest port, in Rotterdam, the Netherlands, which sees the lion's share of the continent's imports and exports. About 34,000 ships and 12 million shipping containers—each large enough to hold 27 refrigerators, 175 bicycles, or 2,500 pairs of jeans—already pass through it each year. But that's nothing compared with the 32 million containers it will handle by 2035. With no land for expansion, the Port of Rotterdam Authority has approved a $4-billion project to turn four square miles of 66-foot-deep ocean into dry ground for what will likely become the most advanced port in the world, Maasvlakte 2. The new facility will include automated container-moving vehicles powered by 13-ton batteries in place of diesel and a harbor so deep it will accommodate superships that haven't even been built yet. So far, dredging boats have vacuumed up more than seven billion cubic feet of sand from the ocean to fill in the new site, which will open its first terminal next year. When the entire port is finished, in 2035, it will see enough containers each month to circle half the Earth.