The visit is guided and has an approximate duration of 45 minutes. For reasons of conservation, there is a maximum quota of people per session and per day. This is done in groups of 20 people maximum throughout the year. It is advisable to book by email or phone calling to (0034) 918.104.22.168 and online purchases at least one day in advance, according to availability. The reserve must be formalized at the box office at least 10 minutes before the start of the visit in the visitor receptioncentre, located next to the parking of the cavity. During the visit the use of comfortable footwear that does not slip and outerwear is recommended.