OverlordContain features and functionality.

This is a method for holding passengers inside an upgraded objects. Sounds confusing. It's not.

Think of a troop transport like the Humvee. That is a single unit which holds passengers. A Humvee uses the 'TransportContain' module. The overlord can't carry troops. However, it can be upgraded with a sub-object which can carry troops. The Overlord has a special module called 'OverlordContain'. This makes the Overlord act as a transport but forwards passengers in to the bunker upgrade module.

HelicContain works more like TransportContain but... that's another video.