What type of situations require closures to be kept closed for darkened ship conditions?

In the context of darkened ship conditions, keeping closures closed during Dog-Zebra conditions is critical for maintaining safety and integrity of the ship's compartments. Dog-Zebra conditions pertain specifically to situations where the ship is instructed to close all watertight doors, hatches, and other barriers, which helps to protect against flooding, ensures stability, and maintains the overall effectiveness of the ship’s damage control measures during conditions where visibility is compromised.

This procedure is essential when the ship is operating in scenarios that require heightened alertness, such as naval operations, where the prevention of water ingress can be a matter of survival. The emphasis on maintaining closures during these conditions aids in conserving resources, preventing accidents due to neglect, and ensuring that personnel can operate in a more controlled and secure environment, especially when visibility is reduced.

The need for closures to remain shut in this specific context underscores the importance of preparedness and adherence to protocol during potentially hazardous situations onboard a vessel.