Question about stealth & detection/alarms. (Still on first level)

[Xenn]

I just got the game and started playing through the intro level where you're escaping the lab (or whatever that is). I've noticed that when I'm spotted by an enemy while sneaking, that the alarm IMMEDIATELY goes off. Is the whole game like that?

Usually in stealth games there will be some leeway between being spotted and when someone triggers an alarm; usually knocking out a guard before they call/ring an alarm can prevent a full blown alert mode. I'm hoping the whole game isn't like this where alert mode is automatically triggered when a guard's eyeballs hit you.

[Agent N]

its not like that but they turn on alarm very fast anyway

[veryhungryperson]

The second door after leaving the medical facility will always trigger an alarm, you did not get spotted, in order to show you how to disable the alarm systems.

Some alarms will sound instantly, cameras, tripwires and people with radios. Most others however will yell to alert others than run to the nearest alarm panel to trigger it.