Amazing Alcatraz discovery: Lasers reveal long-hidden military tunnel and fortifications
Experts have harnessed technology to unlock the hidden military secrets of Alcatraz Island. Using ground penetrating radar and laser scanning technology, experts performed high-tech scans of the penitentiary's former recreation yard to reveal a long-hidden military tunnel and fortifications beneath the prison. Binghamton University Archaeologist Timothy de Smet, said that the structures were in incredibly good condition.
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