This vast underground area is the lower part of the Patio of Cruise, it was an ideal place for the summer period, a garden dug in the earth with the ideal temperature and humidity to beat the heat.
Changed at the time of Alfonso X the Wise, the vaults will be converted into gothic. At the same time, its magnißcent palace was being built.
Under the reign of King Philip III, they are remodeled again and a mannerist source is built, remains of which can be seen in one end of the swimming pool and an access is opened, to communicate them with the Dance Garden.