There's at least one documented case of monks and nuns digging tunnels between their respective facilities. https://zwingliusredivivus.wordpress.com/2015/08/12

There's at least one documented case of monks and nuns digging tunnels between their respective facilities. https://zwingliusredivivus.wordpress.com/2015/08/12/fun-facts-from-church-history-the-tunnel-between-the-convent-and-the-monastery/ https://zwingliusredivivus.wordpress.com/2015/08/12/fun-fact...