Archaeologists have harnessed radar and laser scanning technology to reveal a long-hidden military tunnel and fortifications beneath Alcatraz. “The area was essentially bulldozed from the former military installation to the modern prison we see today,” explained de Smet. It’s not clear what the room was used for, although experts think that it may have once served a military purpose. Historic tunnels are found in a number of North American cities, such as the Cobble Hill tunnel in Brooklyn. Built in 1844, the massive tunnel beneath a busy Brooklyn street has been described as the world’s oldest subway tunnel.

Source: Fox News March 07, 2019 21:00 UTC