Regarding what I said about the 'Dynamic Environmental SH5 Shallow Waters V2.1' mod (I referred to another mod and I'm sorry for any confusion) I meant what I said.
Water in a harbour in the 30's/40's I think could not have been that transparent. I simply don't believe it.
In that mod the water looks like what I've seen in the Caribbeans at some lovely, sunny beach. Not in a harbour with water polluted with oil and much, much more.
Or were those ships environment friendly? Don't think so.
The sub looks like it's flying/levitating. The shadow of the sub shouldn't be visible.