english: It had deep underwater microphones, or hydrophones, cabled to shore, all wired back to a central place that could listen to sounds over the whole North Atlantic.
non_english: Boli to mikrofóny hlboko pod vodou, hydrofóny, prepojené s pevninou a všetky spojené v centrálnom mieste, kde načúvali zvukom v celom severnom Atlantiku.