The Cytech mod and the underground map are a challenge to use for script makers. There are some specialties when it comes to certain things.
Some of the functions are a bit tricky to use, but you can always get help on the Cytech Discord.
Opening and closing doors is fairly easy in arma. Just use
[building, doorIndex, animationPhase] call BIS_fnc_door
as described in the Arma 3 Wiki.
But on Cytech door we have sone SFX that you might want to trigges aswell.
Therefore we need to find out what door object we are using and whats the corresponding sfx we want to trigger.
To find its config use right click -> Find in ConfigViewer...
I personally like to use Advanced Developer Tools because its way faster then the default Config Viewer, but the default one works fine as well.
Inside Config viewer Scroll down to the UserAction class of this asset.
There you will find the Actions To Open and Close the Door.
Now take a look at the statement.
That's the part of the config where the script statement to trigger the door is defined. eg:
([cursorObject,1,1] call BIS_fnc_Door); [cursorObject,'open'] spawn CYT_fnc_SFX_VerticalBlastDoor_01;
will open this Vertical Blast Door.