modular_nova/modules/random_ship_event/random_ship_event.dm

/proc/init_random_ship_events	Initializes the random ship events glob list, adding all subtypes that can roll this shift.
/datum/random_ship_event	Random ship datum that may approach the station.
/proc/spawn_random_ship	Spawns the random ship proper, with the follow-up effects, if you've set any up.