How should crew members be equipped before reentering a space filled with carbon dioxide?

Before reentering a space filled with carbon dioxide, crew members must wear full personal protective clothing, a self-contained breathing apparatus (SCBA), and carry a charged hose. This is crucial because carbon dioxide is a colorless, odorless gas that can displace oxygen in the atmosphere, creating an environment that poses immediate and serious health risks including unconsciousness and death due to asphyxiation.

The use of SCBA ensures that crew members have a safe, breathable air supply separate from the contaminated atmosphere. Full protective clothing is necessary to shield them from any potential corrosive or toxic chemical interactions with materials present in the environment. Additionally, having a charged hose ready allows for immediate firefighting capability should there be flammable materials in the area, ensuring that any fire can be dealt with swiftly to protect both the crew and the vessel.

In contrast, standard uniforms or light protective gear would not provide adequate protection against the risks associated with carbon dioxide-filled environments. Not equipping with special equipment could expose crew members to life-threatening dangers, demonstrating why the correct answer emphasizes the importance of full protective measures.