So does the Walsh Institute not have an alarm?

I mean you’d think they would so as soon as Walsh unlocks the door the alarm is going to immediately be tripped. Then assuming off camera those two guys made him turn it off most security systems have a hostage code that you type in when being forced to deactivate it which would have tipped off the cops that something was going on at the Walsh Institute. There’s no way Castor turned it off, first of all he has no face and is never going to be able to find the control panel, secondly he doesn’t know the code.