(not-comparable, of a body of water or part thereof) Cleared of mines (explosive devices).
Having survived the seemingly-random attacks through the day, and now under the cover of night, the Germans seem to have a clear run to safety. However, back when the route became clear thanks to the Enigma intercepts, Bomber Command had laid more mines in the swept channel. And now, along comes Gneisenau! 2019 January 9, Drachinifel, 32:48 from the start, in The Channel Dash / Operation Cerberus - How to win through refuge in audacity, archived from the original on 24 Jul 2022: