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How did excavated rock from Gibraltar’s tunnels expand the territory’s land area?

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The Rock of Gibraltar rises steeply behind a coastal city, with green-blue water in the foreground and a partly cloudy sky above. — Gibraltar The rock of Gibraltar.

Early in the 20th century, the Rock of Gibraltar was tunneled to improve communication between the east and west sides of the peninsula. The rock and debris removed during this excavation process were used to reclaim 64 acres (26 hectares) of land from the sea, which significantly expanded the area of the settlement.1