Why submarines abandoned stern torpedo tubes

Why did navies stop fitting stern torpedo tubes to submarines?

Maneuvering torpedoes made them less necessary, while engineering plants and sensors made aft space more valuable.

Modern torpedoes can maneuver after launch, reducing the need to fire directly astern. At the same time, denser propulsion machinery and towed-array equipment compete for the submarine's aft volume. Oberon-class boats retained stern tubes into service as late as the 1980s even after compatible weapons disappeared. The Australian example turns that obsolescence into a practical detail: crews reportedly used the cool, unused tubes for storage, including beer.