I'm currently brewing up a nice campaign to scare my players a bit and the starting mission involves a large freighter. Not a container ship but a normal freighter for all sorts smaller cargo. Yes, I know that there aren't many around any more and that the trend is leaning towards container shipping but still. The freighter will one day steer in the direction of the harbor of Seattle without responding to any calls. The thing has quite some speed and mass so no one would be able to stop it in time even if they did manage to shut off the engines. Well, long story short, the ship crashes into the seattle harbor, sinking a handfull of ships in the process and generally creating a great deal of havoc as it smashes into the docks. When the harbor security (who would that be, anyways? LoneStar? Military? Someone else?) enters the ship to investigate the strange behaviour and to shut off the engines that keep pushing the ship into the container terminal they find the ship empty. Well, not empty, but... dead. There's no living being aboard. Corpses is all that they find, other than the usual contents of a freighter (what is usually on a freighter anyways, aside from freight?). Anyways, the security people seal the freighter off, not letting anyone get near it until things are cleared. The fun part is that there is... something on the ship. I'm not clear as to what it is. Some creature, probably nothing canon. It will be a pretty creepy athmosphere. The shaman will have funny feelings, there will be random... odd things. half empty coffee cups, half eaten meals, weird noises, etc. Maybe they will even find some recordings or log books if they search. None of the security guards will dare to enter the ship. Maybe they've even lost some guards inside under mysterious circumstances and are not scared shitless.
This is where the players come in: their fixer was expecting an urgent delivery with that ship. I haven't decided what it is yet. Any ideas? Shouldn't be too large so that it can be taken off the ship with at least a small chance of not getting caught. So, nothing bigger or heavier than a filled coffin (which would be kinda neat

It's a team of four players, by the way. Three of them newbies. A shaman (seductress), a decker, a sam and a sniper/face.
So, well, yea... um... what would this freighter look like? Are there floorplans somewhere? (I didn't find any). What would security be like in such a case? Any ideas how a team like described above could handle the task of getting an item off the ship without getting the fixer in trouble?
Any other input concerning the scenario? I apreciate any input.
Thanks a lot in advance.