Seven Modern wonders of the world

Panama Canal

The Panama Canal is a major ship canal that traverses the Isthmus of Panama in Central America, connecting the Atlantic and Pacific Oceans. Construction of the canal was one of the largest and most difficult engineering projects ever undertaken. It has had an enormous impact on shipping between the two oceans, obviating the long and treacherous route via the Drake Passage and Cape Horn at the southernmost tip of South America. A ship sailing from New York to San Francisco via the canal travels 9,500 km (6,000 miles), well under half the distance of the previous 22,500 km (14,000 mi) route around Cape Horn. Although the concept of a canal near Panama dates back to the early 16th century, the first attempt to construct a canal began in 1880 under French leadership. After this attempt failed which saw 20,000 workers die, the project of building a canal was attempted and completed by the United States in Panama in 1914, when the canal opened. The building of the 77 km (48 mi) canal was plagued by problems, including disease and landslides. As many as 27,500 workers are estimated to have died during construction of the canal.
Since opening, the canal has been enormously successful, and continues to be a key conduit for international shipping. Each year more than 14,000 ships pass through the canal, carrying more than 203 million tons of cargo. By 2002 about 800,000 ships had used the canal altogether.
The canal can accommodate vessels from small private yachts up to fairly large commercial ships. The maximum size of vessel that can use the canal is known as Panamax; an increasing number of modern ships exceed this limit, and are known as post-Panamax vessels. A typical passage through the canal by a cargo ship takes around nine hours. 14,011 vessels passed through in 2005, with a total capacity of 278.8 million tons, making an average of almost 40 vessels per day.

Capacity
The canal is presently handling more vessel traffic than had ever been envisioned by its builders. In 1934 it was estimated that the maximum capacity of the canal would be around 80 million tons per year; as noted above, canal traffic in 2005 consisted of 278.8 million tons of shipping.
Despite the gains which have been made in efficiency, the canal is soon expected to approach its maximum capacity. An additional complication is that the proportion of large (close to Panamax-sized) ships transiting is increasing steadily; this may result in a further reduction in the number of transits, even if cargo tonnage rises. In any case, if the canal is to continue to serve the needs of world shipping, action will be required to increase its capacity.