 When work on UB @-@ 7 and UB @-@ 8 was complete at the Germaniwerft yard , they were both readied for rail shipment . The process of shipping a UB I boat involved breaking the submarine down into what was essentially a knock down kit . Each boat was broken into approximately fifteen pieces and loaded on to eight railway flatcars . The boats were ready for shipment to the main Austrian naval base at Pola on 15 March , despite the fact that the Austrian pair was still not ready . German engineers and technicians that accompanied the German boats to Pola worked under the supervision of Kapitänleutnant Hans Adam , head of the newly created U @-@ boat special command ( German : Sonderkommando ) . Typically , the UB I assembly process took about two to three weeks , and , accordingly , UB @-@ 7 was launched at Pola sometime in April . 
