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Here we see an aerial photo showing U-boats in the south lock at St Nazaire. 'A' is a 220ft Type XIV supply boat 'Milchkuh' or Milk Cow, used to carry supplies to active boats to lengthen the time they could send on patrols. 'B' was described in the wartime recognition magazine as a 517t U-boat of the same length. This makes it a Type VII of some sort, although the 517t weight comes from the First World War era Type UBIII, one of the precursors of the Type VII. The Type VIIA was 211ft long, the Type VIIC 220ft, but both were heavier than the Type UBIII.