Hydra, a sophisticated top-secret communications relay station that facilitated the transmission of Allied sensitive and secret information during the war, and continued to operate until 1969. Built and run by Canadian electrical engineer Benjamin de Forest Bayly, it was considered one of the world's most advanced communications centres at that time. In the fall of 1945, the Royal Canadian Mounted Police delivered to Camp X one of its most informative visitors, Igor Gouzenko, a Russian embassy cypher-clerk who defected to Canada. During an extensive debriefing, Igor revealed the magnitude of an elaborate Soviet espionage operation in Canada. In March 2012 Parks Canada designated "Camp X" a National Historic Event. The Garden of Remembrance On September 15, 2004, alumni veterans from the Soldiers' Tower Committee and members of 2 Intelligence Company held a ceremony to dedicate the Pickersgill-Macalister Garden of Remembrance at the foot of Soldiers' Tower to the memory of Captain John MacAlister and Captain Frank Pickersgill. MacAlister and Pickersgill were members of 2 Intelligence Company who were executed in the Buchenwald concentration camp by the German Gestapo, after being parachuted into France for the SOE prior to D-Day. A plaque at the garden displays the following inscription: "This garden is in memory of those who gave their lives for peace and freedom. It was originally dedicated to the memory of Captain John Kenneth Macalister (University College BA 1936) and Captain Frank Herbert Dedrick Pickersgill (University College MA 1938)". The late University College principal Douglas LePan (BA 1935, DLitt 1990, DLitt Sac. Hon. 1997) a veteran and award-winning poet, had known Macalister as a student, and was chiefly responsible for the creation of the Pickersgill-Macalister Memorial Garden on the west side of Soldiers' Tower. In 1995 LePan published a long verse drama about MacAlister titled MacAlister, or Dying in the Dark. Centennial Cannon The Intelligence Corps' Centennial Cannon was produced by Compton House Limited as an operational muzzle-loading cannon to be fired for the Canadian Centennial. It is a George III one-pounder, however it carries the Canadian Intelligence Corps crest in place of the George III cipher. Two C INT C "collar dogs" are mounted on the forward face of the carriage. The squat 30-inch barrel is mounted on an oak carriage, fitted with bronze wheels, trunion caps and hardware. The barrel is cast in iron, with drawn steel bore tube for reinforcement. It weighs 83 pounds. The Centennial Cannon