The 300-U-boat counterfactual extends beyond British yards to the wider imperial shipbuilding system. Sloop flotillas could be ordered in Canada, Australia, India, and potentially South Africa while Britain produced its own. Purpose-built sloops would be built to naval standards and could carry well-worked-up anti-submarine crews before war began. Because escort crews can often survive damage and retain experience whereas a lost submarine usually takes its crew with it, the long-term experience balance could also favor the defenders.
Notable Point · 1:10:18-1:11:54
Empire-wide sloop production in the 300-U-boat counterfactual
A conspicuous German submarine buildup could trigger escort construction not only in Britain but also in Canada, Australia, India, and South Africa.