Ice thickness measuring,Lake Baikal,Russia. Man drilling into ice using an auger to measure its depth. During winter,Lake Baikal freezes over and an 80 centimetre thick layer of forms over the surface. The depth measurement allows clearance for transport across the lake. Lake Baikal is one of the oldest freshwater lakes in the world (20-25 million years ago) and one of the deepest (1,642 metres deep) | |
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