Why First World War mine clearance ended

Did First World War mine cleanup stop because another war was coming?

No. Most work is described as completed during the 1920s, with further clearance ending when it was no longer considered worthwhile.

First World War mine clearance is described as occupying much of the 1920s. The follow-up rejects the suggestion that the work stopped because another war was approaching. Most mines had been removed, and the remaining work had reached a point where continuing was no longer considered worthwhile. The operation also provided substantial employment for Germany's maritime population during the postwar period.