Yves D Wrote:
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> It can be said that a position between Cabo de
> Roca and Cabo Espichel is roughly matching with
> the mines laid by UC54 though it covers a rather
> wide area.


It is in fact a very, very wide area.
According to the news at the time (and I do mean news, and not official reports), NRP Roberto Ivens was sunk 12 miles South of Cascais, and 8 miles south-west of the light-house Bugio, light-house which is rigth in the midle of the entrance of the river Tejo, in Lisbon.


>The sinking position needs to be more
> accurate to ascertain the credit to UC54 even if
> it is more likely the possibility.

The depth there is hundreds of meters, I am not sure what may have been done there.
I would be grateful for any information concerning mine-laying activities near Lisbon.