According to his own statement, Schumann served as a ship’s doctor for three years and because he did not have a German passport, he applied for one in Japan in 1954 and received it under his own name.
Podľa jeho vlastného prehlásenia slúžil ako lekár na lodi 3 roky, a keďže nemal nemecký pas, bol prijatý roku 1954 v Japonsku.