Archaeologists Find Network of Tunnels Below Alcatraz
Tunnels were just discovered under the infamous high-security penitentiary of Alcatraz, but, surprisingly, they aren’t relics of prisoners’ attempts to escape. Archaeologists have long suspected that the prison was built over a Civil War-era military fortification, and these findings confirm it. Experts used ground-penetrating radar and terrestrial laser scans (to avoid disturbing the land while digging), as well as historical maps and photographs to find a series of tunnels, fully buried structures, and even ammunition magazines underneath Alcatraz’s prison yard.