The Drilling Operation (image) Hokkaido University Share Print E-Mail Caption The researchers in the drilling operation (left) and the drilled samples (right). Credit Hokkaido University Usage Restrictions These images are copyrighted and can be used for reporting this press release if appropriately credited. Share Print E-Mail 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.