Italian submarines in World War Two

Grongo (GG)

TypeSea going 
ClassTritone (type I) (26) 
Laid down 1 Apr 1942 Odero-Terni-Orlando, Muggiano
Launched6 May 1943
End service
Loss date9 Sep 1943
Loss position44° 05'N, 9° 50'E
History Scuttled at La Spezia on 9th September 1943 to prevent her capture by the Germans. Raised and renamed UIT-20 but never completed. Destroyed in an air raid on Genoa on 4th September 1944.


CommanderDate fromDate toCommand notes

Ships hit

No ships hit by this submarine.

Patrols and events

 CommanderDateTimePortArr. dateArr. timeArr. portMilesDescription
6 May 1943La Spezia6 May 1943La SpeziaLaunched at La Spezia. Had been assigned to X.Mas since 30 March 1943.

Ferrini, Renato11 Aug 19430915La Spezia11 Aug 19431820La SpeziaTrials.

Ferrini, Renato19 Aug 1943La Spezia19 Aug 1943La SpeziaTrials escorted by MAS 525.

Ferrini, Renato9 Sep 1943La Spezia9 Sep 1943ScuttledScuttled (incomplete) after armistice. refloated by Germans and became UIT-20.
  9 Sep 1943
(0) La Spezia harbour.
At the Armistice, Grongo was unable to sail to join the Allies and was scuttled by her crew. She was later raised and became incorporated in the German Navy as UIT-20.

16 Mar 194416 Mar 1944Reported operational.

7 Aug 1944La Spezia9 Aug 1944GenoaPassage La Spezia-Genoa (Note: it is not clear why the passage took so long, dates may be incorrect?).

4 Sep 1944Genoa4 Sep 1944SunkSunk by RAF raid. The wreck was later broken up. On 23 August 1944, the Germans had requested training crews for Grongo, Murena and Sparide.
  4 Sep 1944
(0) Genoa harbour.
During an Allied air raid, UIT-20 (ex-Grongo) was sunk by bombs.

7 entries. 7 total patrol entries (0 marked as war patrols) and 2 events.

All Italian submarines