 Galeazzi @-@ Lisi asserted that the new process would " preserve the body indefinitely in its natural state " However , whatever chance the new embalming process had of efficaciously preserving the body was obliterated by intense heat in Castel Gandolfo during the embalming process . As a result , the body decomposed rapidly and the viewing of the faithful had to be terminated abruptly . Galeazzi @-@ Lisi reported that heat in the halls , where the body of the late Pope lay in state , caused chemical reactions which required it to be treated twice after the original preparation . Swiss Guards stationed around Pius XII 's body were reported to have become ill during their vigil . 
