Exploring Guatemalan Caves (IMAGE) University of Nevada, Las Vegas Caption Matthew Lachniet, professor and chair of the geoscience department at UNLV, completes field work underground in Rey Marcos Cave, Guatemala, which is a subterranean wonder of stalactites, stalagmites, and a disappearing river. Credit Amos Winter, Indiana State University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.