The word under is the most common. It is usually used for three-dimensional objects:

I found my textbook under the bed.

The cat is lying under the table.

The papers are under that magazine.

Under can be used both when the objects are touching (as in the papers and magazine) and when the objects are not touching (as in the cat and table).

You can also use "under" with numbers to mean "less than":

He ran a marathon in under 4 hours. or less than 4 hours

We're looking to buy a house that's under $100,000. or less than $100,000

The word below is often used when describing levels or limits:

The people who live in the apartment below mine are so loud.

The price of gas dropped below $3 a gallon.

Temperatures will be below freezing tonight.

It is also used to describe something on a lower position on a page:

The map below shows the crime rates in the U.S.

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Beneath and underneath are just more formal words for under:

The sailors had no idea that there were dangerous rocks underneath the surface of the water.

We sat on the beach and enjoyed a wonderful day beneath the clear blue sky.

World Architecture

Chek Lap Kok International Airport

Hong Kong
Hong Kongs new international airport at Chek Lap Kok is the product of what was at the time the worlds largest engineering and architectural projecta logistical marvel that developed designs in only twentyone months and managed a workforce of up to 21,000 to build the airport facilities as well as the island on which they stand and the extensive ground transport links, in only five years. In 1999, a convention of U.S. construction executives and editors named it one of the top ten architectural and engineering achievements of the twentieth century. Anyone who flew into Hong Kong before mid-1998 will always remember the unnerving experience of looking directly into apartment buildings that seemed almost to touch the wingtips as the plane descended to Kai Tak Airporta dubious thrill that is no longer part of a visit to the crowded island. Kai Tak airfield commenced operations around 1924, becoming a Royal Air Force base three years later. In 1935 it was upgraded to suit growing commercial traffic, and two more runways were added over the next twenty-five years. It was renamed Hong Kong International Airport in 1958 and underwent continual extensions and improvements as the number of flights increased at a dizzying rate. Shortly before it closed in 1998, Kai Tak was processing nearly 30 million international passengers and over 1.5 million tons 1.36 million tonnes of international cargo every year. There had been discussions about an out-of-town airport since the 1960s, within an international transport strategy that also included shipping a plan to construct a new airport was announced in October 1988. Although well down the governments list of preferred sites after Nim Wan, Lamma Island, and Clearwater Bay, Chek Lap Kok was chosen, but not unanimously. When it opened on 6 July 1998 the new airport had an annual capacity of 2.76 million tons 2.50 million tonnes of cargo and 35 million passengers, planned to rise to 87 million by the year 2040. The Provisional Airport Authority, charged with planning and realizing the facility, was established in April 1990. The contract, estimated at almost HK$50 billion then equivalent to U.S.$6.4 billion, was awarded to the Mott Consortium, comprising Mott. Connell, Ove Arup and Partners Fisher Marantz, Renfro Stone, OBrien Kreitzberg and Associates Wilbur Smith Associates and the architectural firm of Norman Foster and Partners, which undertook the design of the terminal building. The first construction stage project was the recreation of the site. In 1992 Chek Lap Kok was a 330-foot 100-meter hilltop rising from the sea by June 1995 dredging and reclamation had reshaped it into a 3.7-by-2.2-mile 6-by-3.5-kilometer flat platformabout four times its original area23 feet 7 meters above sea level. For the first year the airport operated with a single runway. Now known as the South Runway, it is used mostly for landings the North Runway, put into service late in August 1999, is used principally for departures. Handling an average of 450 flights a day, Chek Lap Kok has forty-eight frontal aircraft gates at the terminal, twenty-seven on the apron, and thirteen cargo gates. The 1,400-yard-long 1.27-kilometer, nine-level terminal building, under 45 acres 18 hectares of 120-foot-wide 36-meter steel barrel vaults, is the largest enclosed public space ever built. An indicator of the logistical achievement of the entire project, the superstructure of the vast Y-shaped building was completed in only three years. Its design was constrained by off-site fabrication of components that could be site-assembled, in much the same way as Joseph Paxtons Crystal Palace 150 years earlier. The air-cooled central terminal space, over 1,000 feet 300 meters wide, houses the usual airport functions. More than 1 mile 1.6 kilometers of moving walkways carry incoming passengers along the 2,400-foot 720-meter concourse, through the baggage hall, to 124 immigration desks and seventy-six custom positions. Departing passengers are served by 288 check-in desks. Dimensions are difficult to convey suffice it to say that the baggage hall alone is as big as New Yorks Yankee Stadium, and the fully automatic baggage-handling system can process 19,000 items an hour. There is also the inevitable shopping areatheHong Kong Sky Mallin five zones and comprising 154 specialist retail, food, and drink outlets. Nearby, the twelve-story Regal Airport Hotel, with 1,100 rooms and connected to the passenger terminal by a covered walkway, completes the facility. Internal shuttle trains run through a 20-foot-high 6-meter tunnel, 106 feet 32 meters wide, beneath the building. The design of Chek Lap Kok allows for expansion that will include an additional concourse and passenger terminal, as well as additional air cargo, catering, and maintenance facilities. Chek Lap Kok was complemented by a complex Airport Core Project involving several elements and costing HK$ 155.3 billion about U.S.$20 billion. The high-speed Airport Express Railway, part of Hong Kongs mass-transit rail link, and 21 miles 34 kilometers of 3-lane highway across the Tsing Ma Bridge the worlds longest road-rail suspension bridge provide alternative routes between the airport and Kowloon and further through the new Western Tunnel to Hong Kong Island and the central business district. The scheme also includes a new town for 150,000 people, because height restrictions, so necessary for Kai Tak Airport, have now been lifted. And, of course, the 2,350-acre 940-hectare Kai Tak site became free for redevelopment. Plans are in hand for mixed commercial and recreational uses among residential towers accommodating 300,000 people. Work should be completed by 2003.