Safety, Fire & Survival · Enclosed Spaces
The principal hazard when entering an enclosed or confined space aboard ship is:
- AAn oxygen-deficient or toxic atmosphere✓ Correct
- BExcessive lighting
- CLoud noise
- DSlippery decks only
Explanation
Tanks, cofferdams, and void spaces can hold atmospheres that are oxygen-deficient, toxic (e.g., H2S), or flammable. The space must be ventilated and the atmosphere tested for oxygen, flammable gas, and toxics, with a permit and standby attendant, before anyone enters.
Authority: SOLAS XI-1; 46 CFR / IMO enclosed-space guidance
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