Watertight Collision Bulkhead

Why didn't the Titanic have a watertight bulkhead in the ceiling (horizontal water tight bulkhead) above the waterline which would have stopped the flow of water, so that Titanic could be saved?

Chain Locker - an overview

An Analysis of Titanic's Vertical and Lateral Watertight Doors

How transverse watertight bulkheads strengthening bulk carriers structural configuration ?

Short Notes on Types of Bulkheads

New Page 1

DOC) Bulkheads AKHIL PEECHANARI

Deterioration of bulk carriers hull and consequences of hull damage /forward flooding

watertight bulkhead, Page 2

Watertight Bulkheads, Titanic Wiki