Ground penetrating radar finds secret military base under Alcatraz prison
SAN FRANCISCO, CALIFORNIA (INTELLIHUB) — A team from Texas A&M University have discovered a secret military bunker under Alcatraz prison using ground penetrating radar. Prof Mark Everett, one of the team’s leading researchers says that the bunker was built and used well before the American Civil War.
According to Everett, the base was a massive military installation long before it was a prison.
“(The tunnels) would have been used for the fortifications. There would have been movement of man and ammunition; it would have been bomb proof and covered with earth so it would have been protected,“ he explains.
“We get signatures that indicate there is not only a tunnel, but magazine buildings too.” he added.
Apparently, the bunker was no longer used after the site became a prison.
“The main prison building was built in about 1915, and we have photographs showing how the rec yard was constructed,” says Prof Everett.
“But what we don’t really know is what exactly became of the fortifications, what state they are in and what is left of the cultural resources. And although it is not always desirable to excavate, with geophysics we can help people to know what is below the surface without actually disrupting it.” he said.
The research on this underground base is still underway, but it is certain that the government has known about it all this time, the park service even has pictures.
“This is an area that is of most historical significance to the park service. It is a very important part of the fortifications,” says Prof Everett, talking about one of the structures.
“It is called a caponier, and it is a large structure that juts out into the bay and provides defensive cover. We have seen it in the old photographs but it has completely disappeared from present view.”
Below are photos from the National Park Service showing Alcatraz when it was a military base: