During their return to Wilhelmshaven in December , the Republican submarine C - 3 was sunk ; the Germans claimed this was due to a torpedo fired from U-34 .
The Republican ' enquiry claimed its loss was due to an internal explosion .
During their return to Wilhelmshaven in December , the Republican submarine C - 3 was sunk ; the Germans claimed this was due to a torpedo fired from U-34 , although the Republicans ' enquiry claimed its loss was due to an internal explosion .