HMS Hever Castle (K521) depth on the fuses of the projectiles until the moment of firing. A single Squid-launched attack had a success rate of 25%. The class was also provided with HF/DF and Type 277 radar. "Hever Castle" was ordered on 23 January 1943. The ship, named for Hever Castle in Hever, Kent, was laid down on 29 June 1943 and launched on 24 February 1944. At some point in 1943, the ship was transferred to the Royal Canadian Navy. The corvette, renamed "Copper Cliff" after a suburb of Sudbury, Ontario, was commissioned into the Royal Canadian Navy on 25 February 1944 with
Guy Hever and agents from the German Federal Intelligence Service. On the day of his disappearance, a birdwatcher reported seeing a figure in military fatigues on the border, although this report is considered unreliable. Several months later, a woman living near the army base said that she saw someone matching his description walking towards the Syrian border, and a German woman wrote to Hever's mother in 2005 claiming to have seen Hever being interrogated in Damascus. She had previously alerted the IDF of this, but had been ignored. On February 13, 2007, a Syrian organization calling itself "The Resistance Committees for the