December 30th - On This Date

1940	Undaunted	Submarine HMS Undaunted completed
1940	Umpire	Submarine HMS Umpire launched
1940	Unbroken	Submarine HMS Unbroken laid down
1940	Unison	Submarine HMS Unison laid down
1941	Dzik	Submarine HMS Dzik laid down
1942	Simoom	Submarine HMS Simoom completed
1941	Ultor	Submarine HMS Ultor laid down
1944	Tapir	Submarine HMS Tapir completed
1954	Shrimp	Submarine HMS Shrimp launched
1941	HMS Thorn	HMS Thorn torpedoes and sinks the German tanker Campina about 5 nautical miles west off Cape Dukato.
1944	HMS Terrapin	HMS Terrapin sinks two Japanese sailing vessels with gunfire in the Malacca Strait.
1944	HMS Trenchant	HMS Trenchant sinks a Japanese sailing vessel with gunfire in the Malacca Strait.