Answer:Early on, Ariel tells Monica that the old tunnels beneath the church are the burial site of many babies (the results of years of illicit sex between the nuns and priests), and that's what Monica comes across. It's possible the earthquake/aftershocks were meant to have exposed the tombs. The reason some of the bodies look bloody and more 'fresh' is most likely for shock value, typical of Eli Roth films.
Answer: Early on, Ariel tells Monica that the old tunnels beneath the church are the burial site of many babies (the results of years of illicit sex between the nuns and priests), and that's what Monica comes across. It's possible the earthquake/aftershocks were meant to have exposed the tombs. The reason some of the bodies look bloody and more 'fresh' is most likely for shock value, typical of Eli Roth films.
Purple_Girl