IDRIS Inner Doha Re-Sewerage Implementation Strategy  –  in Qatar, consisting of three tunnels each 3 metres in diameter with a maximum working pressure of 2 bar.

Tunnel 1- a drive of 7385metres, tunnel 2 – a drive of 4900 metres and tunnel 3 a drive of 3910 metres, utilising 2-Herrenknecht EPB TBM’s.

A Bouygues-UbrbaconTrading & Contracting Consortium with expected completion in 2019.