Monastery
“My theory:. On the day he vanished he had some type of misfortune and ended up in a monastery. Romania is an Orthodox country. Monks, especially good ones, might not ask too many questions if he just decided to stay and could still work.”
“Once his mind started to go, the Abbot arranged his return. also possible he went over the border maybe Moldavia and that really is remote!” Some people have even more outlandish theories, like the following: