How did radar reduce the danger of surface torpedo attacks on fleets?

Radar significantly reduced the danger of surface torpedo attacks on fleets by enabling the detection and tracking of hostile vessels regardless of light conditions or visibility, such as in thick fog or at night.1

Before the widespread adoption of radar, ships were highly vulnerable to surprise attacks because they relied on visual observation to identify threats. The development of shipboard surveillance radar allowed naval forces to monitor their surroundings continuously, providing early warning of approaching enemy craft. By using radio echoes to detect targets, navigators could identify the presence of other vessels at distances that far exceeded the limitations of human sight. This capability allowed fleets to maintain defensive postures and take evasive actions or engage threats before they could successfully launch torpedoes, thereby fundamentally changing naval warfare by removing the advantage of concealment previously enjoyed by attackers.21