The tunnel is located on the Gorica–Biljesevo subsection of pan-European Corridor Vc which connects Hungary with the Adriatic Sea coast via Bosnia and Croatia.
So far 60% of excavation works on the 2.928-kilometre tunnel had been completed, JP Autoceste FBiH said in a statement on its website.
Some 300 workers are hired to work on the project.
The Federation is one of the two autonomous entities which make up Bosnia and Herzegovina. The other one is the Serb Republic.