and wide. It is not built in a straight line, but rather in a zig-zag pattern, so as to lessen the concussion from a direct bomb hit. At various points along the tunnel, there are small rooms which, at one time, were equipped with cots so that the tunnel itself could be used as a shelter. The tunnel is guarded by the Secret Service, and includes cameras, alarms, and cipher locks. Related tunnels Tunnels connecting the Treasury The Treasury Building is the center of a network of tunnels. In addition to the tunnel connecting it to the White House, another connects to the Treasury Annex and H Street NW, constructed in 1919 and known since 2015 as Freedman's Bank Building. Unlike the White House to Treasury Building tunnel, which was constructed as an emergency exit, the other tunnel was built to facilitate the movement of freight and access to utility lines. Tunnel "Project ZP" According to a 1996 issue of U.S. News & World Report, a tunnel was dug into the White House connecting the Oval Office to a location in the East Wing. The tunnel is purportedly accessed through a door adjacent to the president's restroom, which leads to a staircase used to enter the tunnel. The excavation of this tunnel, called "Project ZP", was undertaken in 1987 to provide a route for the president to be quickly and privately moved to the Presidential Emergency Operations Center in the event of an emergency. During the last days of the Reagan presidency, the Project ZP tunnel was allegedly used, in combination with the White House to Treasury Building tunnel, to allow Richard Nixon discreet access to the Oval Office for at least one consultation with Ronald Reagan. White House Big Dig During the 2011 White House Big Dig, a tunnel was excavated near the West Wing. According to officials, that tunnel was intended for access to utilities. White House tunnels in fiction In the 1993 motion picture Dave, a tunnel leads from the White House to nearby Lafayette Square. A tunnel to Lafayette Park, said to have been created by Abraham Lincoln, also features in the 1997 thriller Murder at 1600, based on the novel Murder in the White House by Margaret Truman, daughter of President Harry S. Truman. See also Escape tunnel Vorbunker Notes References White House Continuity of government in the United States Air raid shelters Tunnels in