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I would approach it like this: each package is a "level". Each level something interesting or unexpected should happen. It doesn't have to be a lot, it just has to be something to tell me that I should keep going. (Do you remember those old point-and-click adventure games? There would often be times where you had to do some action three times to progress, but the game would always show a bit of progress each time, like a new line of dialogue or some cracks appearing more and more in a wall, or something, to indicate that you're progressing and not just doing the same action possibly forever.)

So I would make a list and write down, for each package, what is the new thing this time? I think it would help if you added one new element: the package comes into the vessel and you open it up and something is inside. That way, what is inside the package could change. Package 1 is normal, it contains a gear or whatever. Package 2 is mostly normal - it contains a gear but with some slime on it, indicating huh, maybe there's some creature out there. During package 3 the lights go out and you have to find a power source in the dark. Huh that was weird. Each package something new should happen and there should never be a run of two "normal" packages, even if some of them are not super interesting, so I am always being reinforced that something unexpected could happen on any one of these. The longer the game goes, the more interesting the events need to be, to keep my interest.

Hope this helps!