Was this another cabin on the ship, or the brig?!
The Doc takes Des and Sayid to their new upgraded quarters(!), and across the floor scurries a handful of man-eating madagascar-sized roachasauruses! So the Doc gets upset about the bloodstain on the wall and tells Mike/Kevin to get the mop. If I were Sayid or Des, I'd be asking for a can of Raid. The entire ship looks like it could use a good sand blasting and fumigation, actually. I think that Regina jumped off the ship because it's so filthy. And I doubt if Mittlewerk is on this skanky freighter, he seems too prissy. :-)
Anyway, I wonder whose bloodstain that was, or if we'll find out? It's weird how on LOST, some of the redshirts aren't even actual characters....they're just smears on a wall or ceiling.