The Mail Room Flooding Scene was a deleted scene of the 1997 Titanic Film. It can be found in the script at http://sites.inka.de/humpty/titanic/script.html.
The original script:
162 INT. MAIL SORTING ROOM / HOLD
Smith and Andrews come down the steps to the Mail Sorting Room and find the clerks scrambling to pull mail from the racks. They are furiously hauling wet sacks of mail up from the hold below. Andrews climbs partway down the stairs to the hold, which is almost full. Sacks of mail float everywhere. The lights are still on below the surface, casting an eerie glow. The Renault is visible under the water, the brass glinting cheerfully. Andrews looks down as the water covers his shoe, and scrambles back up the stairs.
Concept art was made, but the layout was innacurate. In any case, the scene was not filmed and is usually not featured in the deleted scenes.
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