Transparent Borehole Sampling Tube (IMAGE) CSIRO Australia Caption This is a transparent borehole sampling tube (bailer) showing layer of fuel oil floating on top of groundwater. Credit Willem van Aken 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.