Stupid A/C Chiller System Question

I get your point. But you cannot reach this switch from anywhere near the bed. It is in the back of the hanging locker. And it doesn’t look like anything else on the boat. There are no other switches or items in this style and no labels like this. And ironically the thermostat to turn off the master stateroom entirely is within reach of the bed.
Clearly this was retrofitted by someone. Maybe they wanted the option to turn off one air handler instead of having both running? I don’t know why? I have to play with this some more to see if the air handler fan comes on from this switch even if the rest of the system is off. Maybe someone just wanted the fan to be able to record some air without the whole system being on? I don’t know, it’s a bit of a mastery really. Or as Donzi54 said maybe they bypassed it but then I still don’t get what the switch does it that scenario?