IceCube Scientists (image) American Institute of Physics Caption IceCube scientists deploy a calibration light source, called the Standard Candle in one of the 2.5 km deep holes. Each of the 86 holes contains a string of 60 Digital Optical Modules (DOMs) that detect the blue light from neutrino events in the deep, clear ice. Credit J. Haugen Usage Restrictions None 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.