Expanded wartime crews change the risks of live-weapon training

An accident appears a more plausible explanation for Hårsfjärden when live weapons, intensive training, and reserve mobilisation are considered together. Expanding a largely reserve peacetime force increased the number of people in service and lowered average experience and training. Practices familiar to highly trained crews could become dangerous when applied across the larger force. Close mooring made an accident aboard one destroyer a threat to its neighbours, although mooring space was limited. The subsequent Swedish practice of separating ships during work with live torpedoes and depth charges supports concern about those arrangements. That change does not establish the cause of the first explosion.