Underground bunkers are NOTHING new. The are all over the ancient world enmass and I expect still being used today. Here is a great old book describing ones in Sicily. see Martin Liedke's youtube channel for more info.
Underground bunkers are NOTHING new. The are all over the ancient world enmass and I expect still being used today. Here is a great old book describing ones in Sicily. see Martin Liedke's youtube channel for more info.