COCOLÍ, Panama — For now, the future of global shipping is little more than a hole in the ground here, just a short distance from the Pacific Ocean.

Ah, but what a hole it is.

About a mile long, several hundred feet wide and more than 100 feet deep, the excavation is an initial step in the building of a larger set of locks for the Panama Canal that should double the amount of goods that can pass through it each year.

The $5.25 billion project, scheduled for completion in 2014, is the first expansion in the history of the century-old shortcut between the Atlantic and Pacific. By allowing much bigger container ships and other cargo vessels to easily reach the Eastern United States, it will alter patterns of trade and put pressure on East and Gulf Coast ports like Savannah, Ga., and New Orleans to deepen harbors and expand cargo-handling facilities.

Right now, with its two lanes of locks that can handle ships up to 965 feet long and 106 feet wide — a size known as Panamax — the canal operates at or near its capacity of about 35 ships a day. During much of the year, that can mean dozens of ships are moored off each coast, waiting a day or longer to enter the canal.