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This entrance is located on the island of Malta, near the small village of "Casal Paula." (This village is built on the "Corradino" plateau, and overlooks the capitol town of Malta, "Valletta," as well as Grand Harbour.) In 1902, workmen digging a well in Casal Paula fell into a subterranean cavern. The well was being dug for a house on "Hal Saflienti," the main street in Casal Paula. The cavern the workers had fallen into connected with an entire complex of caves and tunnels. This entrance is known as the "Hypogeum of Hal Saflienti." (In Latin, "Hypogeum" is the name for an underground structure.) "The tunnels under the Hypogeum have been sealed off even since a school took 30 students into the caves and disappeared, guide and all. Search parties were never able to locate any trace of the people and children.
Originally posted by swampcricket
Bases inside some of the most dangerous volcanoes in N. America? (Lassen and Shasta)