What is asdic?

ASDIC, which stands for "Anti-Submarine Detection Investigation Committee," is an early form of sonar technology used primarily during World War II for detecting submarines. It operates by emitting sound waves underwater and analyzing the echoes that bounce back from objects, allowing naval vessels to locate submarines and other underwater obstacles. Although largely replaced by more advanced sonar systems, ASDIC played a crucial role in anti-submarine warfare at the time.