Dubai is planning to get a new deep tunnel sewerage system costing AED 12.5 billion in the next five years, to replace more than 121 sewerage pumping stations. The new deep tunnel system makes use of gravity for the collection of sewage.

https://u.ae/en/information-and-services/infrastructure/civic-facilities

t involves the construction of two sets of deep tunnels terminating at two terminal pump stations located at sewerage treatment plants (STPs) in Warsan and Jebel Ali

https://www.meed.com/dubai-seeks-firms-for-22bn-tunnels-project