On 24 September 2020 there was an explosion at Kop Dağı Tunnel construction (Trabzon-Aşkale road). In explosion 1 worker died and 10 workers seriously injured.

Sayıştay (Turkish State's Audit Unit) blames the Turkish state safeguarding the rights of the pro-AKP (Erdoğan's party governing Turkey) contractors (Bayburt Group's Şenbay Madencilik ile Özgün İnşaat companies) in place of workers.

It became clear that 5 years before the explosion the Karayolları (Turkish public roads) local unit warned that there was gas coming out in the construction....

https://www.evrensel.net/haber/443821/sayistay-raporu-11-iscinin-yandigi-tunel-insaati-kazasindaki-ihmalleri-ortaya-koydu