Angel Fish doesn’t have much of a security system.
Some vessels would have a vast network of finely-tuned detection systems–visual, chemosensor, hymenoptera-driven AI swarm sensors conditioned by neural mapping of certain types of wasps–as well as a means to act on any variances detected, running the spectrum from audible and visual warning systems right up to active area denial systems with vascometrics-based whitelists. But for any number of reasons (not much worth stealing; nobody worth protecting), there’s nothing like that aboard this ship.
Indeed, the vast majority of monitoring undertaken aboard this ship is focused upon policing the behaviour and work output of employees (well, employee) rather than any potential intruder–and whatever cycles that other ships’ computers might use on providing security for its crew and its cargo are used on Angel Fish to ensure that maximum short-term yield is being extracted from its resource investment.
Even when the computer detects something onboard that probably isn’t meant to be there, it doesn’t have the means to do anything about it. Any custom security system to protect erstwhile cargo was stripped out and sold years ago, and nobody was paid to reconfigure the crude integrated alarm system when the ship was refitted. So the detection of variances or anomalies doesn’t really go anywhere: the computer’s decaying old sensors and cameras just stream video and detection data to some console somewhere on the ship, and if Thom’s not there to see it, well… nobody is.
Still, you don’t need fancy-pants detection equipment to get that all-too-familiar feeling that you’re not alone.