iam not shure if it was historical correct, but in a scene from "Das Boot", after a "ALARM" callout (command of preparation process for the emergency dive process)
, the commanding (watch)officer and last man on the bridge, after closing the hatch, gave a additional command "FLUTEN" ("flood"), without beeing able to watch on the cristmas tree. In another scene (Gibraltar), a crew member in the "Command Room" gave imidiatly command "FLUTEN" ("flood") after "ALARM" command from the bridge. The "Kaleun" than gave order "NICHT FLUTEN" ("dont flood") while still on the bridge, "LI" (Leading Engineer) than gave orders to blow tanks to prevent sub from diving and so on...
This also let me think, in emergency situations, the cristmas tree was reviewed from someone while the flooding was already commanded and perhaps also initiated...