Plan Z meets industrial capacity and escort production

Dönitz preferred numerous smaller submarines and supported Plan Z's 1948 requirement for roughly 300 operational boats in a future war with Britain. The episode compares that target with German launch figures: only 63 submarines were launched from 1935 through 1939, leaving an enormous gap between ambition and output. German industrial capacity therefore constrained the strategy before wartime losses and training requirements were considered. Britain was also unlikely to watch such a buildup passively. A Copenhagen-style pre-emptive attack is raised as one possible response before the discussion turns to the more practical prospect of accelerated escort construction. British anti-submarine escort planning moved from defining requirements in 1937-38 to ordering ships in 1939. The Royal Navy and the wider Commonwealth could answer sustained submarine construction with large escort programmes, turning the contest into a production and coalition problem rather than a one-sided race to 300 boats.