The name (Wind Cave) derives from the violent air current which runs through the cave, due to the presence of two openings which are situated at different levels. The lower opening (Tourist Entrance) is situated at 627m. above sea level, whilst the higher opening (which is inaccessible) is 800m. further up at over 1400m. above sea level. The internal temperature constantly maintains itself at 10,7 degrees centigrade. We have therefore, an air current which in summer, being cooler than the external air, is heavier, therefore creating an "outgoing" wind at the lower entrance (incoming at the higher entrance). The situation in winter is reversed: the outside temperature is nearly always lower; the inside air, warmer and therefore lighter, rises creating an incoming wind at the lower entrance (outgoing at the higher entrance). The speed of the wind is directly proportional to the difference between the internal and external temperatures. During tours the armoured door blocks the air current almost completely.