The Ground Tunnels are as their name implies, they go on the ground. Connecting more than 1 to create a Ground Run between enclosures or through the garden.
The Ground Tunnels do not have a floor, they can be screwed in place on a hard surface or pegged in place if on a garden bed or grass. They join together or cut down easily to make any length needed, 90 degree corners are created with a end cap which goes on the Tunnel end. Then it's just a matter of cutting a hole in the tunnel side, then connecting the second piece with C-clips to go around a corner.