After the U.S. entered World War II, Roosevelt, seeing the need to house additional staff and offices to reflect the growing complexity of the federal government at the time, oversaw the addition of the East Wing in 1942, according to the White House.
The two-story structure was built atop the Presidential Emergency Operations Center, or PEOC, a secure bunker that was built by FDR to serve as a secure meeting place in the event of an emergency.
“While the exact specification of this underground presidential bunker is classified,” according to the White House, “it was originally built to withstand a direct nuclear hit. Access to the PEOC is by an elevator located behind multiple vault-type doors with biometric access control systems.”
There was a bunker, it was under the East Wing…
https://www.militarytimes.com/veterans/military-history/2025/10/21/the-wwii-origins-of-the-now-demolished-east-wing-of-the-white-house/
He almost certainly got just far enough to compromise the security of the existing bunker, and now won’t be able to build the new one in time.
It explains why he’s so fucking obsessed with the ballroom