In 1986, during a geological survey before construction of power plants near the Romanian town of Mangalia at a depth of about 18 meters was found closed cave system with original conditions. Fed by ground water with a high content of hydrogen sulphide (8-12 mg / L), a cave called Movil, had its atmosphere, oxygen-poor (7-10%), rich in carbon dioxide (2-3.5%) and containing a significant amount of methane (1 -2%). Her research began in 1990.