Why HMS Venturer’s underwater kill is easy to overlook

Why is the only submerged submarine-versus-submarine kill not better known?

Because it was achieved through painstaking calculation and judgement rather than a dramatic new technology that is easy to popularise.

HMS Venturer’s sinking of U-864 is relatively obscure because the achievement depended on laborious human calculation. Officers and crew had to estimate a three-dimensional firing solution against a submerged target. No single new machine could carry the popular story by itself. Recognition therefore depends on explaining disciplined human work and fallible judgement rather than celebrating an obvious technological breakthrough.