Thanks for all the help with suggestions guys.
As for the ship....welllllll....there is one little toy surprise once our intrepid investigators enter the cargo hold....
It's in the form of all the ship's former crew and those several containers that were full of Russian mail-order "brides"....they've all been turned into undead zombie slaves who shuffle toward the investigators ready to tear them apart....along with a multi-tentacled monstrosity that seems to just get bigger and bigger in size, that's studded with gaping, fanged maws that wants to wrap it's slimy tentacles around the investigators and....well, you get the picture.
Oops, did I mention I was going for a supernatural Lovecraftian horror vibe? Roll for sanity check, please!