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On October 13th, 1918, the Greek sailing ship Biolleta was sunk by the German submarine UC-23 (Hans Georg Lübbe) in the Gulf of Salonika, Aegean Sea (Greece).
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References
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Sailing vessel Biolleta – 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/802.html (accessed 19.10.21).
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WRECKSITE – BIOLLETA 1918 [WWW Document], n.d. URL https://wrecksite.eu/wreck.aspx?145154 (accessed 19.10.21).