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The Greek sailing ship Aghios Johannes was sunk on 24th January 1918 by the German submarine UC-23 (Hans Georg Lübbe), off Skyros (Greece).
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References
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Sailing vessel Aghios Johannes – Ships hit by U-boats – German and Austrian U-boats of World War One – Kaiserliche Marine – uboat.net [WWW Document], n.d. URL https://uboat.net/wwi/ships_hit/96.html (accessed 3.01.22).
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WRECKSITE – AGHIOS JOHANNES 1918 [WWW Document], n.d. URL https://wrecksite.eu/wreck.aspx?144469 (accessed 3.01.22).