Control of the Atlantic enables the decisive fighting in Europe. A defeat at sea would make victory on land impossible, even though success in the Atlantic would not decide the war by itself. Naval power is a prerequisite for the continental campaign rather than its final objective. In wars on this scale, the sea war has to be won first.
Notable Point · 1:45-2:16
Winning at sea is the enabling condition for the land war
Atlantic control enables the European land campaign. Failure at sea makes victory ashore impossible, although naval success cannot decide the whole war alone.