German destroyer Z1 Leberecht Maass
…passive hydrophones designated as 'GHG' (Gruppenhorchgerät) was fitted to detect submarines. Z1 Leberecht Maass, named after Rear Admiral (Konteradmiral) Leberecht Maass, who was killed while commanding German forces in the Battle of Heligoland Bight in August 1914, was the first destroyer to be built in Germany since…