MRT Jakarta Phase 2A Tunnel Excavation Fully Complete as Final TBM Breaks Through at Mangga Besar
With the sixth TBM breakthrough, all tunnels between Bundaran HI and Kota are done; segment one targets operations by end-2027, and the northern tunnel sits 28 meters deep — Indonesia's deepest rail tunnel.
The second tunnel boring machine of contract package CP202, built by a Shimizu-ADHI joint venture, broke through the wall of Mangga Besar station, completing excavation of all six tunnels across three alignments for MRT Jakarta's Phase 2A line between Bundaran HI and Kota, the operator confirmed on 10-11 November.
The northern tunnel sits at the B4 level roughly 28 meters underground, making it the deepest railway tunnel in Indonesia. Segment 1 between Bundaran HI and Monas is targeted to begin operations by the end of 2027, with Segment 2 extending to Kota by the end of 2029. Work now shifts from civil construction to station finishing, systems installation and mechanical-electrical fit-out.
That transition marks the most document-intensive phase of a rail project: as-built drawings, commissioning records, utility integration files and handover documentation, alongside elevated safety oversight for underground station work.