Nullaki (Wilson Inlet) on the south coast of Western Australia lies between Albany and Denmark is opened manually on an annual basis for estuary health and to prevent flooding of low-lying areas. This video documents trenching operations in 2020 and the spectacular flow 24 hours later when the channel had widened to over 100m in width. Department of Water and Environmental Regulation videos document the opening of the bar operations and the flow since 2017.
https://www.youtube.com/@DWER/videos