 The third wave was made up of 117 Lancasters of 5 Group and 52 Halifax and nine Lancaster bombers of 6 Group, which attacked the experimental works, an area containing about 70 small buildings in which the scientific equipment and data were stored, along with the homes of Dornberger and his deputy Wernher von Braun.The wave arrived thirty minutes after the beginning of the attack; the crews found smoke from the bombing and the German smoke screen covered the target, clouds were forming and night-fighters decoyed to Berlin had arrived.The Canadian crews of 6 Group bombed the Pathfinder markers, some of which had drifted east or south and the 5 Group crews made time-and-distance runs, using Rügen as the datum to discover the wind and then flying at a speed which covered the to the target in slightly more than 60 seconds.