A new locale has emerged in the constant search for those fabled pits of gravel.
In the mounting desperation, fuelled by the ever growing gravel shortages, the teams have taken to searching below the surface of the earth itself.

In preparation for the ensuing subterrainean conflict, both sides have contracted out for underground bases from the famous fortress builders of TF2M.

Unfortunately, both teams have selected the same site for their secret bases, and when this is discovered, all hell breaks loose as each side tries to repel the interlopers.