Dutch submarines for Europe and the East Indies

The Dutch entered the war with the deepest submarine expertise of the four navies and a fleet split between home-water O boats and colonial K boats. European defense and distant East Indies patrols demanded different range, endurance, maintenance, and habitability. That two-theater logic produced many capable designs but also a striking gap: only two boats could lay mines, despite the importance of submarines and minelaying to Dutch defense. The comparison invites viewers to judge the fleet by its mission mix rather than by hull count alone.