 During her trials , UB @-@ 7 developed a leak which took some time to repair . In the meantime , she was assigned the Austrian number of U @-@ 7 and an Austrian commander . Her German crew at Pola — since it was still the intent for UB @-@ 7 to be transferred to the K.u.K. Kriegsmarine — wore either civilian clothes or Austrian uniforms . As time dragged on , the Austrian U @-@ 3 and U @-@ 4 were still not ready , and eventually Admiral Anton Haus , the head of the Austrian Navy , reneged on his commitment because of the overt hostility from neighbor and former ally Italy . 
