The Proyecto Espeleológico Purificación is a non-profit organization dedicated to the study and exploration of the caves and karst of the Purificacion Karst Region, in the states of Nuevo Leon and Tamaulipas, Mexico. The PEP publishes a yearly journal, the Death Coral Caver. Membership in the PEP is open to interested individuals who share the project's goals of careful caving. Annual dues are $15 per year. Members will receive newsletters as they are published and may vote in elections of the Board of Directors. The information on this site is presented in the non-profit spirit, and may not be used for commercial purposes.