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High-tech laser scans uncover hidden military traverse at Alcatraz Island

February 27, 2019

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High-tech radar and laser scans have uncovered a hidden military traverse underneath the infamous Alcatraz penitentiary.

from Top Technology News -- ScienceDaily https://ift.tt/2TdpDRN

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High-tech laser scans uncover hidden military traverse at Alcatraz Island

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