Close-up of final crack (IMAGE) Aalto University Caption The displacement measuring instruments at Aalto University's Ice Tank, the largest of its kind in the world, detect the crack opening to the level of microns. In this image the crack has split the ice completely into two pieces. Credit Iman El Gharamti/Aalto University 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.