The Autonomous Underwater Vehicle Sentry (IMAGE) U.S. National Science Foundation Caption The autonomous underwater vehicle Sentry is capable of exploring the ocean down to 19,685 feet. Credit Luis Lamar, Woods Hole Oceanographic Institution 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.