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On July 14th, 1918, Hagios Zion, a Greek sailing vessel of 4 tons, was sunk by the German submarine UC-37 (Otto Kümpel).
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References
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Sailing vessel Hagios Zion – 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/7614.html (accessed 2.7.21).
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WRECKSITE – HAGIOS ZION 1918 [WWW Document], n.d. URL https://wrecksite.eu/wreck.aspx?177387 (accessed 2.7.21).