Mussolini was being transported around Italy by his captors – first to Ponza, then to La Maddalena, both small islands in the Tyrrhenian sea. Intercepting a coded Italian radio message, Skorzeny used the reconnaissance provided by the agents and informants (counterfeit notes with a face value of £100,000 forged under Operation Bernhard were used to help obtain information) of SS-Obersturmbannführer Herbert Kappler to determine that Mussolini was being imprisoned at Campo Imperatore Hotel, a ski resort at Campo Imperatore in Italy's Gran Sasso massif, high in the Apennine Mountains.