Call of Cthulhu on a boat

[Elvenoutrider]

I’m running horror on the orient express and looking for some side adventures to run if the party gets off track. I’m not a huge fan of the ones I saw in the campaign book. I don’t want to take them to a new setting and I certainly don’t want to run Cthulhu in wonderland.

In particular a couple of characters are set up as smugglers and their players have implied that they think it would be fun to run into trouble on a boat. Are there any existing adventures that already have that premise?

[Merudo]

The Derelict, for Cthulhu modern.

[Reversefigure4]

Horror on the Orient Express is set on railway lines, to a tight timeline, often in land-locked countries. It's also massively long just as written. Running extra side adventures, and trying to move them from the train to a boat (and presumably back again) is going to be a tall order.