I went in on silent running at around 57ft with all bow tubes open so I could shoot at any DD that came within 1,000 yrds. The DDs that I attacked I sank them at dawn. Went to 90ft during the day then up to 57ft at dusk snapped the photos with the O-scope. I will note that the carriers wheren't all the way in the harbour its self but at the crook in the coast where the pointer on the chart is.

And the two DDs that I attacked.