additional six Norwegian commandos were dropped by parachute by a 138 Squadron Halifax bomber from RAF Tempsford. They landed successfully, and found the Swallow team after a few days of searching on cross-country skis. The combined team made final preparations for their assault, scheduled for the night of 27–28 February 1943. Supplies required by the commandos were dropped with them in special CLE containers. One container was buried in the snow by a Norwegian patriot to hide it from the Germans; he later recovered it, and gave it to an officer of the British Army Air Corps (which was conducting exercises in the area) in August 1976. The container was brought back to England and displayed at the Airborne Museum at Aldershot, which became part of the Imperial War Museum Duxford. After the failed Freshman attempt, the Germans placed mines, floodlights, and additional guards surrounding the plant. Although the mines and lights remained in place, security at the plant had weakened over the winter. The bridge spanning the deep ravine above the river Måna, however, was fully guarded. The force decided to descend into the ravine, ford the icy river and climb the steep hill on the far side. The winter river level was very low, and on the far side (where the ground leveled) they followed a single railway track straight into the plant without encountering any guards. Even before Grouse landed in Norway, SOE had a Norwegian agent in the plant who supplied detailed plans and schedules. The demolition party used this information to enter the main basement by a cable tunnel and through a window. The only person they encountered in the plant was a Norwegian caretaker named Johansen, who was very willing to cooperate with them. The saboteurs then placed explosive charges on the heavy-water electrolysis chambers, and attached a fuse which allowed sufficient time for their escape. In an attempt to prevent reprisals, a Thompson submachine gun was purposely left behind to indicate that this was the work of British forces and not the local resistance. When the fuses were about to be lit, the caretaker was worried about his spectacles (which were somewhere in the room; during the war, new eyeglasses were nearly impossible to obtain). A frantic search ensued; the spectacles were found, and the fuses lit. The explosive charges detonated, destroying the electrolysis chambers. The raid was considered successful. The entire inventory