by Bob Walsh
Modern technology, such as ground penetrating radar, has discovered tunnels, rooms and structures believed to be ammunition magazines below the "modern" structure of Alcatraz prison.
These structures are believed to be left over from fortifications and a military prison built on the Island during the Unpleasantness Between The States.
Archaeologists intend to continue poking around.
The old prison now gets more visitors in a single day than were held there as prisoners during the entire lifetime of the island as a federal prison.
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