Research Encampment on T-3, Spring 1967 (IMAGE) U.S. Geological Survey Caption Aerial view of T-3 Ice Island science encampment in spring 1967 at ~79°N, with person in center for scale. The USGS heat flow data and sediment cores were acquired in the USGS hydrohut on the left. Credit John K. Hall Usage Restrictions Courtesy of John K. Hall 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.