TIL during WWII, Britain hid its wealth 3 floors under Montreal’s Sun Life building. The vault had microphone alarms, walls made of abandoned railway steel, and a door needing 2 blind, simultaneous codes. 120 secret workers sorted billions under strict oaths to keep the entire operation hidden.

During WWII, Britain secretly stored its gold and securities three floors below Montreal’s Sun Life building as part of a covert survival plan, now revealed.
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