Since you're using GWX I assume you've already confirmed that SH-5 Water for SH-3 Foam for LSH is compatible? Seems like if it weren't you'd have had problems before now if your mod list hasn't changed. I'm assuming that the blue interiors for FMNI also include all the necessary FM New Interiors files, since you don't have New Interiors loaded separately?
I'm not familiar with all your mods but nothing else there jumps out at me altho as Vendor indicated you do have some pretty demanding mods with only 2 gigs of RAM onboard. Why that would suddenly make a difference after previous patrols loaded fine... did you have a change of base or anything that required the game to load a more complex harbor scene? Would there be more going on in the harbor at the time/place that this patrol is starting? I don't know that it makes any difference, but on my old computer with less RAM I had issues with the game lagging and freezing after switching to a French base that was getting visits from the RAF, and there would be so much going on when I was leaving and returning there that it really put a strain on my system. Never a CTD on load, though, not for that reason.
You could try just reverting back to an earlier save, you would lose the one(s) that came after it but if it loaded okay then you'd know it was either a corrupt save (which sometimes happens even if you follow all known recommendations) or something that had changed from that patrol to the new one that crashed out on you.