Serpentinized Rock (IMAGE) Duke University Caption Deposits of serpentinized rock such as this could be a previously overlooked source of free hydrogen gas, a new Duke study finds. Credit NOAA Ocean Explorer 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.