Dave Young drilling a hole into the Lower Manorburn dam to measure the ice thickness. You know the bottom of the ice has been reached because the drill pushes through to the other side and water beings flowing back up through the hole

Dave Young drilling a hole into the Lower Manorburn dam to measure the ice thickness. You know the bottom of the ice has been reached because the drill pushes through to the other side and water beings flowing back up through the hole

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