With the Zempire Aerobase 3 Connector, you can string as many Aerobase 3 shelters together as you want. One connector is required to join two shelters together, so with enough shelters and connectors, you could create an Aerobase maze.
Attached with 2-way zippers, this connector creates a weatherproof passage between two shelters, and a handy little clip at the top of the door allows you to secure the two zipper pulls together so no-one from the outside can access your shelter.