The evidence Mr. Draven suggested, specifically, was navigational data and passenger lists. Who goes where, who returns or does not. There may be much more than that, however - heretech homebrew space marines, for one thing. I wonder if there could be more ... nah, likely not.
You could certainly disable the sensor. But it's entirely likely that the only way to access it .... is to open the door. A clever techy would place the workings so that was the only way to get at them.
Reminds me of:
You move down the corridor to the main working area / access point. This is where the primary goods and utility airlock is - opening via a ramp in the floor. Two powerlifters stand by one wall, and various machinery stands about. You also note two articulated gunturrets, clearly intended to defend the ramp in case of attack.
Beyond this area lie the last two storage rooms, and the engineering section.
And the elevator is here. On both out- and inside of the elevator doors is a note reading thusly:
'SPIDERS!
Dear fellow crewmen - and madam - I point your attention to the fact that, owing to our recent infestation of skeezers in the sinks, I have placed and activated spiderbots in all storage compartments.
In the hopes of avoiding what happened to Jurgen last time - can we please all try to remember to *simply reach inside the door, and deactivate them on the wall switch*?
Really guys, I really don't know why this would be so hard to remember.
Owen'
There is also, of course, stairs. And a listing of the decks, as follows:
Deck A: Bridge, captains quarters, quest cabins, defensive arrays 1-2
Deck B: Crews lounge, guest lounge, crews cabins, defensive arrays 3-6
Deck C: Storage A-E, Engineering, automated deck defences
Subdeck: Sinks, engineering crawlspace (added in red marker: Stay out!)
Where to, gentlemen?