The termites can maintain their fungi culture, keeping them wet, even during the most severe droughts. How? Because they dig galleries to the table water or underground springs, even 75 m (225 ft) deep. Moreover, inside the termite mound, there is constantly a humidity of 100 % and a temperature varying between 29?C (84? F) to 31?C (88? F), necessary for both fungi and termites. The galleries form a perfect installation of conditioning air. The orientation north-south of the mounds also helps in thermoregulation. The column of hot air rising in the above ground mounds helps drive air circulation currents inside the subterranean network.