The Swiss Federal Intelligence Service plans to open files on Nazi war criminal Josef Mengele, whose whereabouts after WWII have been shrouded in mystery. Historians have long sought access to these files, which were previously sealed until 2071. Mengele, known for his horrific experiments at Auschwitz, fled to South America after the war, but there are suspicions he may have returned to Switzerland. Despite the potential for revealing information, Swiss authorities have been reluctant to disclose details, fueling conspiracy theories about their motives. Historians express concerns over the lack of transparency and the implications for Switzerland's historical accountability.