sentences:  The councilors listened in silence, and their absence of objection was interpreted by Hans Senn as an implicit approval of the operation, in which they conserved the possibility of plausible denial.The UNA was discovered in the midst of the Bachmann-Schilling affair in November 1979, when Special Service commander Albert Bachmann sent UNA agent Kurt Schilling to Austria to observe military manoeuvres.There, he was arrested and sentenced for espionage by Austrian authorities, before being sent back to Switzerland, and sentenced again for having revealed classified information.