Enter A Bip39 Passphrase. From this position ahead the seed could be published on paper or spoken above phone and this opened up new, Bodily means of backing up the seed (a number of paper copies in several places, resilient copies on metal plates with extra defense from fireplace/flood and https://stephendpzmw.wikibyby.com/1108612/the_anatomy_of_a_bip39_phrase_entropy_phrases_and_security