# Gaziantep Dülük-OSB Tunnel construction

> Live situation record from CLSTR: https://clstr.news/situations/gaziantep-dlk-osb-tunnel-construction
> Updated: 2026-09-08T21:00:00.000Z. Sources: 40. Developments: 2.

Construction is underway on the Dülük-OSB Tunnel in Gaziantep, a strategic infrastructure project intended to connect the city center with the Gaziantep Organized Industrial Zone. The project, a collaboration between the Gaziantep Metropolitan Municipality, the Gaziantep Organized Industrial Zone Presidency, and the General Directorate of Highways, aims to reduce travel time from 45 minutes to 10 minutes via two 3,800-meter-long tunnels.

In August 2026, local officials reported the project was halfway complete, noting that revisions had extended the tunnel and modeled the entrances after the Marmaray in Istanbul.

Following a fatal accident at the site in the Şehitkamil district on September 10, 2026, the Gaziantep Chief Public Prosecutor's Office launched a formal investigation. The incident involved iron scaffolding used to stabilize concrete flexing and trapping workers. While the Gaziantep Governor's Office confirmed that no structural tunnel collapse occurred, the accident resulted in one fatality and five injuries. As part of the ongoing investigation into the tragedy, three company officials—identified as F. A., İ. B., and Y. U. K.—have been detained for their alleged roles in the incident.

## Claims

- No collapse occurred at the tunnel construction site during the incident. (disputed by 2 sources)
- One worker died and five workers were injured in the construction accident. (disputed)
- The accident was caused by the flexing of iron scaffolding used to stabilize concrete during the Dülük-OSB Tunnel construction. (corroborated by 2 sources)
- The accident took place in the Sam neighborhood of the Şehitkamil district in Gaziantep. (corroborated by 2 sources)
- Balıkesir Provincial Directorate of National Education is holding a tender for the reinforcement and repair of three schools in the Gönen district. (single source)
- A tender is being issued for the construction of a 16-classroom primary school and landscaping in Horasan, Erzurum. (single source)
- Repairs are planned for the school building, sports hall roof, and fire escapes at the Şehit Er Cuma Potuk Boarding Middle School in Elbistan. (single source)
- Five school repair and construction projects are being tendered in the Saray district of Van. (single source)
- Eskişehir Osmangazi University is procuring lead aprons for its health application and research center. (single source)
- A tender has been announced for the repair of the Eskişehir Courthouse building. (single source)
- Roof repairs are scheduled for five different service buildings under the Ankara Provincial Police Department. (single source)
- A suspect named C. A. seized a weapon from a security guard and took five bank employees hostage in İzmir. (single source)

## Timeline

### 2026-09-08: Gaziantep tunnel accident leads to one death and three detentions

One worker died and five were injured in a construction accident at the Dülük Tunnel in Gaziantep. Three company officials have been detained following an investigation by the local prosecutor's office.

40 sources. https://clstr.news/cluster/turkey-various-public-tenders-announced-for-infrastructure-and-school-projects

### 2026-08-18: Gaziantep Dülük-OSB Tunnel construction progresses

Construction continues on the Dülük-OSB Tunnel in Gaziantep, which will reduce travel time to the industrial zone from 45 to 10 minutes.

2 sources. https://clstr.news/cluster/gaziantep-dlk-osb-tunnel-construction-progresses

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Cite as: Gaziantep Dülük-OSB Tunnel construction. CLSTR, https://clstr.news/situations/gaziantep-dlk-osb-tunnel-construction