Hi John, U-123's war diary does not indicate anybody by the name of Hannes being injured.

Quote:
Replaced the firing pin of the 20 mm AA gun. We fire a single shot into the scenery to test the weapon. This shot exploded in the barrel, apparently due to a defect in manufacture of the round. Premature detonation. Special leader Art.Mt. Toelle is unfortunately hit by shrapnel on the back of his head and fell to the deck bleeding badly. MtrOGfr. Vonderschen has a 5 cm flesh wound on the left thigh, which is harmless. Not the fault of anyone. Vonderschen belonged to the AA gun crew, Toelle was standing near the aft periscope taking photos of the burning steamer. We were firing to right aft. Toelle lost very much blood and had to vomit several times.