Hi my name is Victor Marafona, I am an instructor in a diving school in the north of portugal Submania, during the summer I usually dive in the U1277 a Uboat of the VIIC/41 class, I recently discovered a schematic of a uboat of the same category that indicates that they have a bell right behind the 37mm flak, but I can't find any photo to confirm this data, does anyone know the existence of a bell in this type of submarine???