Plutonium is part of the Archaeological Site of Eleusis. The monument is a karst landform in the limestone rock, which consists of three shallow, laterally located caves, the eastern, central and western.  which are morphologically housed by an asymmetrical, naturally formed rocky arch that is internally separated by two intermediate pillars. The restoration includes all the necessary stabilization measures to ensure the stability of the space. 

These measures consist of:  συνοπτικά από:

1. Drying and vegetation removal
2. Crack sealing and micro-bleeding,
3. Hole drilling
4. Τσιμεντενέσεις 
5. Hole drilling 
6. Τοποθέτηση και ενεμάτωση αγκυρίων