Anachronisms:
Anachronisms: Submarines of the WW2 era didn't have radar. *No* radar sets of the WW2 era had the now-familiar rotating radius on circular display. I'm also fairly sure (still researching) that WW2 era torpedoes would be utterly useless in a sub-vs-sub engagement, a submarine could only hope to sink another sub if it were caught on the surface.
To correct the above observation, American subs were fitted with radar from 1942, a type known as the SJ, with a twenty mile radius. You must assume the British also had radar in addition to Sonar. There was also in use, accoustic homing torpedoes, although the British did not use them, but the viewer seems to overlook the fact that the 'Scorpion' in the story was possesed!