The Bathtub refers to the underground foundation area at the site of the

World Trade Center World Trade Centers are the hundreds of sites recognized by the World Trade Centers Association. World Trade Center may also refer to: Buildings * World Trade Center (1973–2001), a building complex that was destroyed during the September 11 at ...

and accompanying buildings in

New York City New York, often called New York City (NYC), is the most populous city in the United States, located at the southern tip of New York State on one of the world's largest natural harbors. The city comprises five boroughs, each coextensive w ...

. The term bathtub is something of a misnomer, as the area does not hold any water; rather the purpose of its design is to keep water out. The name is more so used to describe its shape of a deep basin with high walls, like a bathtub.

Description

The Bathtub, built in 1967–1968, encompasses a large, roughly rectangular

excavation Excavation may refer to: * Archaeological excavation * Excavation (medicine) * ''Excavation'' (The Haxan Cloak album), 2013 * ''Excavation'' (Ben Monder album), 2000 * ''Excavation'' (novel), a 2000 novel by James Rollins * '' Excavation: A Mem ...

down to

bedrock In geology, bedrock is solid rock that lies under loose material ( regolith) within the crust of Earth or another terrestrial planet. Definition Bedrock is the solid rock that underlies looser surface material. An exposed portion of bed ...

surrounded by

reinforced concrete Reinforced concrete, also called ferroconcrete or ferro-concrete, is a composite material in which concrete's relatively low tensile strength and ductility are compensated for by the inclusion of reinforcement having higher tensile strength or ...

walls, intended to serve as

dam A dam is a barrier that stops or restricts the flow of surface water or underground streams. Reservoirs created by dams not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use, aqua ...

s to prevent

water Water is an inorganic compound with the chemical formula . It is a transparent, tasteless, odorless, and Color of water, nearly colorless chemical substance. It is the main constituent of Earth's hydrosphere and the fluids of all known liv ...

intrusion from the nearby

Hudson River The Hudson River, historically the North River, is a river that flows from north to south largely through eastern New York (state), New York state. It originates in the Adirondack Mountains at Henderson Lake (New York), Henderson Lake in the ...

( North River). It enclosed nearly the entire original

. The

World Trade Center site The World Trade Center site, often referred to as " Ground Zero" or "the Pile" immediately after the September 11 attacks, is a 14.6-acre (5.9 ha) area in Lower Manhattan in New York City. The site is bounded by Vesey Street to the north ...

was located on man-made water-clogged landfill that had accumulated over centuries, providing an extension of land out onto the Hudson River from the original

Manhattan Manhattan ( ) is the most densely populated and geographically smallest of the Boroughs of New York City, five boroughs of New York City. Coextensive with New York County, Manhattan is the County statistics of the United States#Smallest, larg ...

shoreline, with bedrock located below. Manually removing water from this area would have severely altered the water levels surrounding the World Trade Center site and thus would have jeopardized the foundations of nearby buildings, causing them to sink. This is why the Bathtub method was used. The Bathtub contains a site, including seven basement levels, the downtown terminal of the

PATH A path is a route for physical travel – see Trail. Path or PATH may also refer to: Physical paths of different types * Bicycle path * Bridle path, used by people on horseback * Course (navigation), the intended path of a vehicle * Desir ...

rapid transit Rapid transit or mass rapid transit (MRT) or heavy rail, commonly referred to as metro, is a type of high-capacity public transport that is generally built in urban areas. A grade separation, grade separated rapid transit line below ground su ...

line, and the preexisting

New York City Subway The New York City Subway is a rapid transit system in New York City serving the New York City boroughs, boroughs of Manhattan, Brooklyn, Queens, and the Bronx. It is owned by the government of New York City and leased to the New York City Tr ...

IRT Broadway–Seventh Avenue Line The IRT Broadway–Seventh Avenue Line (also known as the IRT Seventh Avenue Line or the IRT West Side Line) is a New York City Subway line. It is one of several lines that serves the A Division, stretching from South Ferry in Lower Manhatt ...

(). The South Tower of the World Trade Center was actually built around the PATH tubes that passed through the foundation area, thus service was uninterrupted throughout the whole of the construction period. The waterproof walls were thick and high. The excavated material that was dug up to build the bathtub was again used as landfill to construct

Battery Park City Battery Park City is a mainly residential planned community and neighborhood on the west side of the southern tip of the island of Manhattan in New York City. It is bounded by the Hudson River on the west, the Hudson River shoreline on the nor ...

, and the same method was also used to construct the foundation area of the

Willis Tower The Willis Tower, formerly and still commonly referred to as the Sears Tower, is a 110-storey, story, skyscraper in the Chicago Loop, Loop community area of Chicago in Illinois, United States. Designed by architect Bruce Graham and engineer F ...

Chicago Chicago is the List of municipalities in Illinois, most populous city in the U.S. state of Illinois and in the Midwestern United States. With a population of 2,746,388, as of the 2020 United States census, 2020 census, it is the List of Unite ...

. There are several structures that penetrate the Bathtub wall: DWV, utility systems, and PATH trains. Today, a passageway leads between Brookfield Place and the

World Trade Center Transportation Hub The World Trade Center station is a terminal station on the PATH system, within the World Trade Center complex in the Financial District of Manhattan, New York City. It is served by the Newark–World Trade Center line at all times, as wel ...

Problems

FEMA 403 - Ch2 - Figure 2-11 Location of subterranean structure

Once constructed, the bathtub walls relied on the presence of the basement floors of the WTC to give lateral support. When these were partially destroyed following the collapse of the Twin Towers during the

September 11 attacks The September 11 attacks, also known as 9/11, were four coordinated Islamist terrorist suicide attacks by al-Qaeda against the United States in 2001. Nineteen terrorists hijacked four commercial airliners, crashing the first two into ...

, it was feared that removing the resulting debris pile could weaken the walls and cause them to fail, endangering workers and possibly compromising other buildings and flooding a significant portion of the

subway system Rapid transit or mass rapid transit (MRT) or heavy rail, commonly referred to as metro, is a type of high-capacity public transport that is generally built in urban areas. A grade separated rapid transit line below ground surface through a tu ...

. During the recovery and clean-up operation, dangerous degradation of the walls was discovered, prompting an emergency operation to install tiebacks to the bedrock to shore up the bathtub walls. Excavation of a new Bathtub was conducted between 2006 and 2008, with the new Bathtub reaching underground.

References

{{DEFAULTSORT:Bathtub World Trade Center Aftermath of the September 11 attacks