I saw these caves on a National Geographic special and was blown away by the size of the cave and the giant gypsum crystals that grow inside from all surfaces of the cave. In the small mining town of Chihuahua, Mexico scientists travel deep below the surface into the cave which is a constant 112 degrees Fahrenheit with a 90-100 percent humidity. The explorers of the cave have to first test their phsical ability in the cave for five minutes. If they can stand the heat, they can then go back in the cave to take samples and explore the structures around them in special suits. The suits have a layer that contain ice packs to keep the body at a safe temperature, along with other layers that keep the heat out. They also have to wear a special oxygen mask that blows cool air on their eyes so they don’t dry out. Scientists have taken samples of the water inside the crystals that they are testing to see if there are ancient bacterias held within. The caves hold a lot of mistery and wonder, but may soon close because of the water being held out of the cave by the local mining companies.