Here's the 'trench' in a later frame. I was hoping to see a nice curved leading edge but no, it's blunt. But it's straight
How about the trailing edge, minus the control surface? yes that would fit. Therefore the leading edge must be towards the top of the picture
Blast, the image doesn't extend that far
Wait a minute though, whats that unusual shape near the top of the image? outlined in blue. Could that be the the trailing edge of an engine nacelle? I'm having difficulty in orientation with this one though. Is it the topside of a wing or, the bottom? I suspect it's the wing from previous postings of images starting from 'the door' and working through 'the fuselage/floor/wing root/rib/spar' and 'wing tip' sequence plus an image taken in 1938.
The red line is a datum point for another picture showing the orientation and, line of view from ROV lens. I'll post more detailed stills later.