In World War II, the area was highly involved in the development and production of the V-1 and V-2 rockets, until the production's relocation to Nordhausen. The village's docks were used for the ships which recovered V-2 wreckage from test launches over the Baltic Sea. German scientists such as Wernher von Braun, who worked at the V-2 facility, were known as "Peenemünders". The resistance group around the priest Heinrich Maier passed on plans for the V-1, V-2 rockets, and the Peenemünde research station to the Allies. The resistance group, later discovered by the Gestapo, was in contact with Allen Dulles, the head of the US secret service OSS in Switzerland. The allied bombers were able to carry out precise air attacks with the sketches of the production facilities. The information was important for Operation Crossbow and Operation Hydra, both pre-missions for Operation Overlord. During Operation Hydra, the research facility was badly hit by the attack by the RAF bomber command on Peenemünde on the night of August 17–18, 1943. The attack was carried out by a total of 596 bombers (324 Avro Lancaster, 218 Handley Page Halifax, 54 Short Stirling). There was extensive destruction and the rocket launch of the prototype V-2 was delayed by about two months. 123 people died, including the scientist Walter Thiel. Wernher von Braun was able to save himself in a bunker.