He fell in love with speleology as a little boy and the passion for caves still hasn't left him. Since the 1980s, Marek has organized speleological expeditions into interesting karst areas around the world and actively explores new cave systems. In 2002, on Mount Roraima of the tepui plateau in Venezuela, he discovered the longest quartz cave in the world – Ojos de cristal.
Marek, as our greatest underground photography specialist, has participated in many international expeditions during which significant speleological discoveries took place. He documented, for example, the discovery of the Cave of Three Naked Men in Iran, which is currently the longest salt cave in the world. Together with other scientists, he created the NAMAK project, which examines the salt beauty of southern Iran to this today. In addition to classic cave exploration, the NAMAK team of speleologists also deals with a number of scientific tasks.