When loading or unloading explosives, which of the following is true of the cargo space itself?

Precautions for Specific Hazards:
Class 1 (Explosives) Materials: Turn your engine off before loading or unloading any explosives. Then check the cargo space. You must:
- Disable cargo heaters. Disconnect heater power sources and drain heater fuel tanks.
- Make sure there are no sharp points that might damage cargo. Look for bolts, screws, nails, broken side panels and broken floorboards.
- Use a floor lining with Division 1.1, 1.2 or 1.3. The floors must be tight and the liner must be either non-metallic material or non-ferrous metal.