Chikyu / ちきゅう (IMAGE) University of Texas at Austin Caption The deep sea scientific drilling vessel Chikyu, which in 2018 performed the deepest drilling of a subduction zone earthquake fault. Credit Satoshi Kaya/FlickR Usage Restrictions Credit must be given to the creator. Adaptations must be shared under the same terms. License CC BY-SA 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.