MRT Phase 2A Tunnel Construction Completed

PT MRT Jakarta has recorded an important milestone in the construction of MRT Jakarta Phase 2A. Tunnel boring machine (TBM) 2 for CP202 successfully broke through the wall of the B2 level on the south side of Mangga Besar Station.

The endpoint is also at Mangga Besar Station

This success marks the completion of tunneling work using TBM 2. This tunnel will later serve as the railway line heading towards Lebak Bulus BSI Station.

PT MRT Jakarta Construction Director Weni Maulina said that TBM 2 constructed the southbound tunnel through two phases. The first phase took place from the north side of Harmoni Station to the south side of Sawah Besar Station for nearly three months, from July to October 2025.

MRT Jakarta Enhances Preventive Measures Following Kiosk Fire at Blok M Hub

"In the next phase, TBM-2 was then moved to the north side of Sawah Besar Station to continue construction to the south side of Mangga Besar Station from February to July 2026," she expressed, Tuesday (11/10).

She stated that this successful tunnel breakthrough marks the completion of all tunneling work for the Phase 2A North-South line.

She went on to say that the northbound tunnel towards Kota Station had already been completed earlier in July 2026.

"The endpoint is also at Mangga Besar Station, but at the B4 level at a depth of about 28 meters below ground level," she revealed.

She mentioned that this depth makes the northbound tunnel the deepest railway tunnel in Indonesia.

"We appreciate the hard work of all parties who successfully built the two Phase 2A North-South line tunnels with good results. We believe that in the future, this tunnel construction will become a source of knowledge for the development of civil construction in Indonesia," she concluded.

In constructing all the Phase 2A North-South line tunnels, the construction team used six units of tunnel boring machines.

In detail, two units were used to build the tunnel from Bundaran HI Bank Jakarta Station to Harmoni Station, two units from Harmoni Station to Mangga Besar Station, and two units for the tunnel from Mangga Besar Station to Kota Station.

PT MRT Jakarta aims to complete and operationalize Phase 2A of the North-South line—specifically Segment 1 covering Bundaran HI to Monas—by the end of 2027, followed by Segment 2 extending to Kota by late 2029.