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The external tubes are probably only be used for large submarine simulator type decoys. IIRC some earlier commie submarines had dedicated tubes for this too, in contrast to the USN which fires its submarine simulator out of the normal tubes (displacing weapons internally as a resulting) while having only small dedicated tubes for smaller types of decoys and noisemakers. The mix of 65cm and 53cm tubes is logical enough for the Russians. They have some very long range anti submarine missiles you can only shoot out of 65cm, but most of the main anti submarine torpedo types they have are 53cm. So you need both. This is just what you get when you let the Russians design weapons, they love specialization. They'd design a different torpedo and torpedo tube caliber for each class of western SSN if given the chance.
The external tubes are probably only be used for large submarine simulator type decoys. IIRC some earlier commie submarines had dedicated tubes for this too, in contrast to the USN which fires its submarine simulator out of the normal tubes (displacing weapons internally as a resulting) while having only small dedicated tubes for smaller types of decoys and noisemakers.
The mix of 65cm and 53cm tubes is logical enough for the Russians. They have some very long range anti submarine missiles you can only shoot out of 65cm, but most of the main anti submarine torpedo types they have are 53cm. So you need both. This is just what you get when you let the Russians design weapons, they love specialization. They'd design a different torpedo and torpedo tube caliber for each class of western SSN if given the chance.