The delivered compartmentation reference data includes compartment tanks, unknown and void compartments, habitable compartments, compartments for cargo and machinery, and ship zones for planning, fire, and damage control.
In addition, void spaces are provided. These volumes set aside space reservation in a model.
Compartments, void spaces, ship zones, interference zones, and regions are not represented by 3D symbols, so you do not need to be concerned with 3D symbol creation and definition. You can type NULL in this field or leave it blank.