[U796]

Originally Posted by Sir Big Jugs

This would suggest it is a Type IID:

See that it has wirecutters not only above the water line, but also under, at the torpedo tubes?
The boat in the picture also has that, but the Type IIC didn't, according to Uboat.net:

I agree with you.
I think it's U-138 (Type IID)
U-Boat.net said :
26 Sep, 1940
A few hours before reaching her base at Lorient, U-138 encountered the British submarine HMS Tribune which fired four torpedoes towards the German sub. None hit the U-boat, which escaped and reached its base.