Hi Letum,
unfortunately I can only go from the programme, which stated that he was unaware of a threat from another submarine, and the zigg-zag pattern was to confuse surface vessels. You may be right, but I was just recounting the information in the programme. The u-boat was in periodic radio contact and I suspect that the transcripts of these messages were used to confirm that he was not expecting trouble from another sub. I can't tell you any more I'm afraid, as I simply don't know enough about it.
Cheers,
martin
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