Titanic's effect on naval subdivision

Did naval design change after the sinking of Titanic?

Yes; designers paid more attention to subdivision that stopped water moving vertically and horizontally, including stronger deck-level watertight boundaries.

Earlier subdivision often focused on transverse bulkheads rising only to a selected deck. Titanic demonstrated that flooding could overtop those boundaries and progress through the ship. Naval architects consequently strengthened deck-level and longitudinal watertight division so damage would be contained in more than one direction.