Shown here is the Type VIIC seagoing boat U571 under Oblt.z.See der reserve Helmut Block in front of the bunker at La Pallice date unknown. Note the floats of the massive anti-torpedo net in the foreground. A smaller bunker, housing an electricity transformer for the U-Boat base, can be seen to the left of the tall chimney in the midle of the picture. Taken from Hitler's U-Boat Bases.