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On September 17th, 1918, Portaritissa, an Italian sailing vessel of 16 tons, was sunk by the Austrian submarine K.U.K. U-27 (Josef Holub) close to the island of Crete. There were no casualties.
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References
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Sailing vessel Portaritissa – 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/4877.html (accessed 7.5.20).
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WRECKSITE – PORTARITISSA 1918 [WWW Document], n.d. URL https://wrecksite.eu/wreck.aspx?162693 (accessed 7.5.20).