第二次世界大战爆发后,潜伏在大西洋运输线上的德国潜艇恶狼般地频频出击,“扑食”盟国的军舰与商船。开始,由于盟国海军的反潜力量势单力薄,难以抵御德军潜艇凌厉的攻势。而盟军飞机当时完全依靠飞行员的目视搜索,水面舰艇尽管装设了声呐,但由于技术不过关,作用距离太短,对水下噪声分辨率低,难以发现德潜艇,致使己方被击沉的运输船越来越多。为此,盟军最高统帅部着了急,下令一定要把这些“水下鼹鼠”一网打尽。可 After the outbreak of the Second World War, the German submarines lurking in the Atlantic transport line attacked wickedly and wreaked havoc on the warships and merchant ships in the allies. In the beginning, due to the weak anti-submarine forces of the Allied Navy, it was hard to resist the fierce attacks of the German submarines. Allied aircraft was completely dependent on the pilot’s visual search, although the surface naval sonar installed, but because of technology, however, the role of the distance is too short, the resolution of underwater noise is low, it is difficult to find German submarines, causing oneself to be sunk More and more transport ships. To this end, the supreme commander of the Allied forces took a hurry and ordered that these “underwater moles” must be brought to a close. can