Amazing Alcatraz discovery: Lasers reveal long-hidden military tunnel and fortifications

Name: Amazing Alcatraz discovery: Lasers reveal long-hidden military tunnel and fortifications
Uploaded: 2019-03-07T22:07:51Z
Duration: 2 min 21 s
Description: Experts have harnessed technology to unlock the hidden military secrets of Alcatraz Island.

Experts have harnessed technology to unlock the hidden military secrets of Alcatraz Island.