@gouldjg, South Manchester near the airport.
On topic, I went in that U505 mission and moved the player sub further away to see what would happen.
I was detected straight away, I dove further down and rigged for silent, I got attacked by an aircraft that gave my position away, so I altered course, 2 DD's came straight for me and I got the hedge-hogs plus DC's, badly damaged I dive further down but it was too late, heavy flooding, below crush depth, Aagh!
I was being pinged all the time btw.