She was commissioned on 26 August 1943, under the command of Oblt.

She was commissioned in September under the command of Lieutenant Charles Jordan.

Siren was commissioned in March 1761 under the command of Charles Douglas.

She was commissioned in 1806 under the command of Lieutenant John Campbell.

Medusa was commissioned on 25 April 1801 under the command of John Gore.

UB-81 was commissioned later that same year under the command of Reinhold Saltzwedel.

UB-48 was commissioned later that same year under the command of Wolfgang Steinbauer.

She was commissioned into the Kriegsmarine under the command of Kplt.

Nymphe was commissioned in 1803 under the command of Captain Somerville.

She was then commissioned as S-4 on 14 July 1943 under the command of an Italian captain.