Let the Convoy Sink

Immediately after breaking Enigma, the team learns that a U-boat attack will hit Peter's brother's convoy. Turing stops them from sending a warning because saving it would reveal the breakthrough, then proposes using the intelligence only when the Germans will not detect a pattern.

The most locally compassionate action would destroy the long-term value of the system. It is a vivid case of optimizing under secrecy, uncertainty, and conflicting human values—and of delegating life-or-death tradeoffs to a small group with little oversight.

The decision is made by accountable humans in wartime, not an autonomous model, and the film compresses and dramatizes the history.