Presidential Emergency Operations Center (The Era of Relative Peace)

The Presidential Emergency Operations Center (also called the President's Emergency Operations Center; PEOC), commonly known as the White House Bunker or the White House Bomb Shelter, is a bunker-like structure situated below the East Wing of the White House in Washington, D.C. It is designated as an emergency command post by the President of the United States and the cabinet during times of emergency (i.e. invasion, terrorist attack, incoming nuclear missile, etc.) when evacuation from the White House is not possible.

Construction
The PEOC was originally built as a bomb shelter in 1942 on the orders of Franklin D. Roosevelt. It is rumored to be connected to the underground tunnel system connecting the White House to the Eisenhower Executive Office Building and the U.S. Treasury Department building. Under the Harry S. Truman administration, the PEOC was modified to withstand a nuclear blast as renovations along the White House was ongoing.

World War III
The United States Secret Service prepared the PEOC for President George H.W. Bush and the cabinet in an event of an emergency when World War III broke out in June 1989. When word was received that the Soviet Union conducted a surprise limited invasion of Alaska and Washington State on November 9, 1989, the first time that foreign combatants were present on the U.S. mainland since the War of 1812, Bush, the First Lady, several officials and cabinet members were evacuated to the PEOC. 25 years after the war in 2014, Bush would later recall how he was transferred from the PEOC to Camp David and Mount Weather whenever the Secret Service saw fit for the President's safety.

21st Century
Rumors stated that the PEOC was further modified even after the end of World War III. During the September 11th Attacks in 2001 across several cities in the United States, Vice President Colin Powell and several officials were evacuated to the PEOC while President Norman Schwarzkopf Jr. was airlifted to Air Force One.