Nearly thirty additional French submarines could patrol off Germany, Norway, the Netherlands, and occupied coasts alongside British and Polish boats. Germany had already lost destroyers at Narvik, so protecting coastal traffic and screening surface sorties would place more demands on scarce escorts. The French boats are treated as technologically credible designs rather than token additions. Their value comes from cumulative patrol coverage, sightings, and interception chances rather than from assuming one decisive submarine action.
Notable Point · 35:24-36:26
French submarines tighten the northern blockade
Nearly thirty Atlantic submarines would add patrol density around German, Norwegian, and occupied European ports.