Inside the covered lifeboat with the captain, I’d be surprised if they had anything larger than pistols, or maybe machine-pistols. Knives almost certainly: they would be the most convenient weapon to use to hold the captain at close quarters, without risking injury to each other.
I’m going to guess switchblade or lockblade knives, the sort that are easy to carry. Machetes would have been useful for taking the ship, as they’d be something like cutlasses. Inside the lifeboat they would be much harder to use effectively.
There are also hatchets and a few knives as part of the lifeboat’s provisions.