SOS is a really versatile distress call. You can shout it; you can tap it out in Morse code; you can honk it on a horn; you can signal it with flashes of light; you can spell it out on the beach with debris from your wrecked ship. Explaining where SOS came from and what it means are maritime archivist Christian Ostersehlte from the German Maritime Museum, and Paul Tyreman from PK Porthcurno, the Museum of Global Telecommunications. Find more information about the topics in this episode at theallusionist.org/sos.  There are a couple of category B swears in this episode. The music is by Martin Austwick. Hear Martin’s own songs at palebirdmusic.com or search for Pale Bird on Bandcamp and Spotify, and he’s @martinaustwick on Twitter and Instagram.  The Allusionist's online home is theallusionist.org. Support the show by becoming a patron at patreon.com/allusionist. Stay in touch at twitter.com/allusionistshow, facebook.com/allusionists how and instagram.com/allusionistshow.Support the show: http://patreon.com/allusionistSee omnystudio.com/listener for privacy information.See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.