The case list began with a Wikipedia table limited to sinkings that killed more than 150 people. The coincidence of Britannic and Kongō falling within the same ten November days prompted investigation and verification of the other qualifying losses. That method produces a manageable comparative survey and exposes recurring operational patterns. It also selects for catastrophic casualties, so the sample cannot represent every successful submarine attack or patrol. The result shows how an online list can support a research question when its selection rule remains visible.
Notable Point · 1:05:57-1:07:15
A casualty threshold shapes the ten-day sample
An online list of sinkings with more than 150 deaths becomes a research question whose selection rule remains visible.