Leading from Krum to Denton along Fm 1173 are seven sites equally spaced apart that mark a line of underground secret stuff which is intentionally located near railroad connections to Denton. The sites include: Icehouse, Library and Slab, Schertz Farm, Krum Silo, Three Silos, Boat House and Chicken Farm. Each of these seven sites are marked today with either a slab, silo or building to conceal the location of the entrance (Icehouse) and several airshafts leading from Krum to Denton. Goods and troops would travel along the railroad from Dallas or Ft. Worth to Krum and enter through concrete stairs at what today is the Icehouse where the rest of the journey would continue through the underground tunnel to Denton.