HI-SEAS 2 (IMAGE) European Geosciences Union Caption HI-SEAS crewmember exploring Mauna Loa's lava tubes as analogs for lava tubes on Mars and the moon. Credit HI-SEAS Usage Restrictions Must be attributed 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.