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 on 17 August 2003 and sister Shir. Hever had previously been sentenced to 21 days confinement for falling asleep during guard duty. On Saturday night, Hever was tasked with placing stickers on crates of supplies, an order he refused to carry out, and accordingly received a court martial summoning for insubordination. On Sunday morning, he finished his guard duty at 9:15 AM and was last seen at 9:30 AM buying a can of Coca-Cola, still in his uniform and with rifle in hand, then leaving the base without permission. He was never seen again after this. The original IDF investigation