First, shove the worst offender in the hotbox. Leave them there until they are nearly dead. See if that changes their tune.
In not, on to phase two...
If they've befriended any of the NPCs... kill one, with extreme prejudice.
Have Plugg and Scourge let them know that since they seem unconcerned for their own safety, if they don't fall in line, their friends will suffer and die in their place.
as above and...
Don't kill them or keelhaul them yet..
Make them suffer, whip them, scourge them, sweatbox them, shout at them intimidate them, belittle them for the smallest thing they do wrong (think drill sergent but a lot meaner), let the NPC's loyale to Plugg give them hell (soap in a towel at night anyone?).
If all that fails then change the whip to a cat and deal lethal so they are at - HP then drag them back to the bunks (have Sandara cure them after though but leave them fatigued for the next day).
If that fails have Harrigan step in, one hit and the PC's will be down to minus HP straight away. You need to garner the fear in them early that this guy is a mean SOB and slightly on edge, don't give the idea away that he is level 16 but play up the fact that he is unreachable and untouchable.
You NEED to be brutal but DON'T kill them (well maybe if they are stupid), they need to feel afraid but also more impotantly they need to get the idea of revenge in thier minds.
Just remember that you don't have to kill them to install a healthy dose of fear, knocking them unconcoius is enough to do that (remember too that if they are fatigued then work the next day is going to be harder, if they fail they will get that whip again).
This part of the AP is meant to be harsh and brutal, do you're job right and you sow the seeds for the mutiny later and the whole story of Harrigan as a nemesis will work well later.
