The official Japanese version of both dead suggest that a plane carrying him crashed resulting in his demise. However, some searchers and experts question the credibility of this theory due to the absence of reliable evidence and the fact that boss had a history of escaping dangerous situations. Gumnami Baba Theory one prominent theory suggests that Bose assumed the identity of a holy man named Gumnami Baba and lived in Fezabad, Uttar Pradesh, India until his death in 1985