Which feature helps prevent progressive flooding from a breached compartment?

• A. A horizontal deck element that divides compartments.
• B. A radar mast component.
• C. A vertical partition that helps contain flooding and maintain buoyancy and stability.
• D. A temporary barrier used during port entries.

Answer: (C)

Watertight isolation between compartments is what prevents progressive flooding after a breach. A vertical partition, or watertight bulkhead, creates a sealed barrier that confines flooding to the breached compartment and preserves buoyancy and stability in the rest of the ship. This containment slows the spread of water and helps maintain enough intact buoyant volume to keep the vessel afloat and controllable. In contrast, a horizontal deck element divides levels but does not by itself stop water from spreading if there’s a breach elsewhere, since water can move around or over inadequate seals. A radar mast component has no role in flood control, and a temporary barrier used during port entries isn’t a permanent solution to prevent flooding at sea.