Principal photography began in the Canton of Bern, Switzerland, on 21 October 1968, with the first scene shot being an aerial view of Bond climbing the stairs of Blofeld's mountain retreat to meet the girls. The scenes were shot at the revolving restaurant Piz Gloria, located atop the Schilthorn near the village of Mürren. The location was found by production manager Hubert Fröhlich after three weeks of location scouting in France and Switzerland. The restaurant was still under construction, but the producers found the location interesting, and had to finance the provision of electricity and the aerial lift to make filming there possible. Various chase scenes in the Alps were shot at Lauterbrunnen and Saas-Fee, while the Christmas celebrations were filmed in Grindelwald, and some scenes were shot on location in Bern. Production was hampered by weak snowfall which was unfavourable to the skiing action scenes. The producers even considered moving to another location in Switzerland, but it was taken by the production of Downhill Racer. The Swiss filming ended up running 56 days over schedule. In March 1969, production moved to England, with London's Pinewood Studios being used for interior shooting, and M's house being shot in Marlow, Buckinghamshire. In April, the filmmakers went to Portugal, where principal photography wrapped in May. The pre-credit coastal and hotel scenes were filmed at Hotel Estoril Palacio in Estoril and Guincho Beach, Cascais, while Lisbon was used for the reunion of Bond and Tracy, and the ending employed a mountain road in the Arrábida National Park near Setúbal. Harry Saltzman wanted the Portuguese scenes to be in France, but after searching there, Peter Hunt considered that not only were the locations not photogenic, but were already overexposed.