UB-II class submersibles

UB-2 class (1915-18) German Empire – 30 submarines, UB-18 to UB-47 UB-45 underway in 1916 The UB-II class. Second part

UB-II class submersibles

How fast can a German U-boat go? - Quora

UB-II class submersibles

Submarine type ii hi-res stock photography and images - Alamy

Type II U-Boat

How was air stored on World War 1 and 2 submarines? - Quora

UB-II class submersibles

U-boat - Wikipedia

Teaching of the class in the course of Decommissioning and Dismantling of Ships and Offshore Assets, promoted by IPETEC – Instituto de Pesquisa Educação e Tecnologia. – TechCon

German Type UC II submarine - Wikipedia

Was the U-boat the first submarine? - Quora

The Golden Age of Submarines Goldwag's Journal on Civilization

War Ships - Submarine Warfare An Illustrated History by Dellvzla - Issuu

NEMO Submarine