Swiss film director Frederic Gonseth hopes his documentary on the extraordinary wartime experiences of a group of doctors and nurses will raise Hongkongers' awareness of humanitarian work. Gonseth, who is in Hong Kong for the MAX! German language film festival, said people's support could help humanitarian organisations fight institutions' manipulation, as illustrated in his documentary Mission in Hell. The film is a series of testimonies by doctors and nurses hired by the Swiss Red Cross in the second world war. Believing they were volunteers for the Red Cross, they were shocked when they arrived at the eastern front to find they were in fact part of the German army under a secret deal between Switzerland and Germany. And they were ordered to keep their mouths shut when they returned home. Gonseth and his partner, Catherine Azad, discovered the story while making another documentary on the fall of the Berlin Wall. 'When I asked them about the incident, it was a big surprise for them because they had never had a chance to speak about it,' said Gonseth. Mission in Hell will screen at the Hong Kong Film Archive on Sunday at 5pm.