Junkers Ju 52 "Minensuch" variant with a 14 meter diameter current-carrying degaussing ring under the airframe to create a magnetic field that triggered submerged naval mines : r/WeirdWings
Degaussing - Wikipedia
Vickers Wellington outfitted with a degaussing ring to sweep for magnetically triggered naval mines in WWII : r/aviation
Any WW2 carrier aircraft deployed with with degaussing rings? | Aircraft of World War II - WW2Aircraft.net Forums