According to Nguyen Duc Hoa, a trusted servant of the Old Bao Dai Hoang Ngo Dinh Diem and the time is still important in the service of the President Palace I, he knew very well the secret tunnel construction in this house recalled after Phu Quoc Pham Dinh bombing Independence, Ngo Dinh Diem panicked and went to call the contractor Phan Match Dalat and ordered to rebuild concrete fortified tunnels to escape the misfortune happen "coup"
To build a secret tunnel, it has raised more than 20 masons, iron skilled to work and eat at the spot, "domestic real output, any external input", the construction dragged on for nearly two years to complete.
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