A lock is a device used for raising and lowering boats, ships between stretches of water of different levels on river and canal waterways.
Following are a couple of videos of the Hammarby lock(Swedish: Hammarbyslussen) in action. This lock separates the freshwater Lake Mälaren and the Hammarby lake(Swedish: Hammarby sjö, part of the Baltic Sea). Shot from a boat, , cloudy and cold weather, accompanied by a corner seat hindered shooting of a good quality video.
Life is about being kinetic 