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  • How It Works

    TEN SECRET UNDERGROUND WORLDS

    Jun 08, 2023 5 minutes

    DID YOU KNOW? The humidity in Naica’s crystal cave can reach 90 per cent

    1 CAVE OF GIANT CRYSTALS

    NAICA MINE, MEXICO

    Naica’s crystal cave was first discovered by miners in 1910 and is home to giant selenite crystals. These are made of the mineral gypsum, with the largest crystal measuring 12 metres in length and four metres thick. Heat from the magma below aided in the formation of these giant gems, but it also makes a visit to this underground wonder extremely uncomfortable. Temperatures of 58 degrees Celsius have been recorded in this 120-metre-deep cave, preventing access to tourists. When scientists investigate the towering translucent structures, they need to wear special cooling suits to survive in this jagged crystalline world. A maximum time of 45 minutes can be spent in the cave even with these suits. Overstaying in Naica’s crystal cave increases the chances

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