This is great, though it seems like a daunting task. Based on your mentioning securing the tow, am I right to assume you're on a tugboat? Is an sm boat just a small boat? Like a RIB or fast rescue boat? Would that even run after an EMP event? I'd imagine it isn't practical to row, and I'd further imagine no one keeps an efficient row boat handy on deck these days.

I'm not sure I fully understand EMP, but from what I do understand, anything that can carry a current will, unless it is shielded. As such I'd think that the electrical systems both on the tug and the sm boat COULD be destroyed. Leaving you trying to stop hundreds or thousands of tonnes of cargo with some seriously questionable method, like manually releasing the anchor windlass and praying. Ha. You've certainly got me thinking!