The ninth Tunnel Boring Machine (TBM) breakthrough for the MRT Sungai Buloh-Serdang-Putrajaya (SSP) Line took place on 8 November 2019 at the Ampang Park MRT Station.

TBM S-1063 mined from the Hospital Kuala Lumpur (HKL) Crossover to the Ampang Park MRT Station, a distance of 1.9km, after its launch on 9 February 2019.

This milestone marked the steady progress of the overall SSP Line construction which was at 63.5% as of 31 October 2019.

The progress for tunneling works for the same period was at 61.1% while the overall progress for underground works, which included both tunneling and underground station works, was at 66.8%.

The 8 completed tunnel drives are from Sentul West Station to Titiwangsa Station, Titiwangsa Station to HKL Station, HKL Station to Kampung Baru North Station, Kampung Baru North Station to Ampang Park Station, Chan Sow Lin Station to Bandar Malaysia North Station and Bandar Malaysia North Station to Bandar Malaysia South Station. These completed tunnel sections amounted to 14,441m total of tunneling distance.

Three tunneling sections are in progress at the Sentul West Station to the North Portal, Conlay Station towards KLCC East and Ampang Park stations as well as Chan Sow Lin Station towards Tun Razak Exchange (TRX) Station.

In addition, there are two sections which have not begun; from Bandar Malaysia South Station to the South Portal and Conlay Station towards TRX Station.

The total bored tunnel length which is the total TBM travel distance including bore through and pull through stations, is 23,624m and the tunneling works is scheduled to complete in July 2020.