DEW technology has been on the MILSAT books since 1985… haven't you seen the movie Real Genius? C'mon, man.
Disneyland, located in Anaheim, CA, was built by Walt Disney in 1955.
Disneyland has a massive underground service tunnel structure under the main park. This underground structure contains many tunnels and shortcuts for cast members and service personnel.
Epstein Island was built with the exact same philosophy.