Cleaning the locks
A diver uses a ladder to climb into the 37-degree water to reach the MacArthur Lock floor where he will inspect the areas around the gates and valves and assist with debris removal. This is done annually as a part of the Soo Locks winter maintenance.

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Photo by: 121217-A-YU979-112 |  VIRIN: 121217-A-YU979-112.JPG