Airlock
From Battlestar Wiki, the free, open content Battlestar Galactica encyclopedia and episode guide
Airlocks serve as the entrance and exits to spaceships, whether it is docking with another ship or for extravehicular activity (EVA).
Ejecting a person from an airlock or launch tube is a common and easy execution method ("Flesh and Bone", "Collaborators") and the phrase "throwing someone out of an airlock" has gained some notoriety.
Some airlocks have an observation booth from where a depressuried airlock can be safely monitored by personell. It has the same layout as the launch tube control room (A Day in the Life).