This route into Switzerland was discovered by Larive in 1940 on his first escape attempt from an Oflag in Soest .
Importantly for other internees in the camp , among the 68 Dutch was Hans Larive with his knowledge of the Singen route .
This route into Switzerland was discovered by Hans Larive in 1940 on Hans Larive 's first escape attempt from an Oflag in Soest .
Importantly for other internees in the camp , among the 68 Dutch was Hans Larive with his knowledge of the Singen route .