Answer: asdic

AnswerCrossword Clue
ASDICSonar
ASDICEarly sonar, to Brits
ASDICSonar, to Brits
ASDICBritish submarine detection device.
ASDICBritish sonar.
ASDICSonar, British style.
ASDICAntisubmarine device.
ASDICSonar.
ASDICBritish sub-detection apparatus
ASDICSonar, in England
ASDICSonar in Soho
ASDICSonar device
asdicsonar (an underwater locating device)
asdicsonar