IF "detect" then comms depth is useful and realistic.
you are detected by enemy sub , he comes to comms and lets a few patrolling airplanes know where you are so they can come sink you.
or to have your ai ally subs clue you in to the enemies position. etc
( hey dude we found the convoy ! )
IF "detect" set depth x
can also be used to set sub to a depth and/or speed required
for launch of a specific weapon (such as ss n 27 or VLS tubes)
to bring a kilo up from "too deep to fire torpedoes" position.
or to mimic it going deep and slow in an attempt to remain covert. (under therm)
you can also use if detect with a specific sensor to
mimic different reactions based on proximity. (the max range of the sensor)
gotta love the variablility
