Prior to the reconstruction, excavation and research of the graveyard were conducted in 1974; the scientific analysis of the bunes of the deceased revealed that his height was 159.4 cm (it was an average height of that time), while the analysis of the hair of the deceased showed his blood type was ABO type.
再建に先駆けて、昭和49年（1974年）には発掘調査が行われ、遺骨の学術的調査から身長は159.4センチメートル（当時の平均的身長）であることや、遺骸毛髪から血液型がABO式血液型であることが判明した。