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Final tunnel breakthrough ends excavation for Lima's first underground metro

Final tunnel breakthrough ends excavation for Lima's first underground metro

Built World

TBM Micaela reaches Carmen de la Legua, completing 35 km of boring for Lines 2 and 4

Today: Micaela completes final breakthrough at Carmen de la Legua

Overview

Updated 1 hour ago

Peru's first underground metro now has every tunnel dug. The tunnel boring machine Micaela broke through at Carmen de la Legua station in late October 2026, finishing the last of 35 kilometers of excavation for Lines 2 and 4 of the Metro de Lima.

The project links the port and industrial zones of Callao with central and eastern Lima, serving ten districts and roughly 2.5 million people. The trip from Ate to Callao should fall from about 2 hours 45 minutes to 45 minutes once trains run. Station interiors and railway systems are still under construction, with the overall project about 81% complete.

Why it matters

Once open, Lima's first underground metro cuts a 165-minute cross-city trip to about 45 minutes for 2.5 million residents.

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Key Indicators

35 km
Total tunnels excavated
Combined length of Line 2 and the Line 4 branch bores, now fully dug.
81.27%
Project physical progress, October 2026
Ositrán's monthly tracking of Lines 2 and 4, including stations and systems.
$5.35B
Total project investment
Value cited by the transport ministry for the metro project.
10
Districts served
Ten Lima districts connected when both lines are operational.
24,000+
Peak-hour passengers at Carmen de la Legua
Projected ridership at the interchange station between Lines 2 and 4.

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People Involved

Organizations Involved

Timeline

November 2022 November 2026

5 events Latest: Today
Tap a bar to jump to that date
  1. Micaela scheduled to move to a retrieval shaft

    Upcoming Construction

    After arriving at Carmen de la Legua, the TBM is set to be dismantled and removed from the tunnel.

  2. Micaela completes final breakthrough at Carmen de la Legua

    Today Milestone

    The TBM reaches the eighth and last station of the Line 4 section, ending all 35 km of tunnel excavation. A ceremony was held October 22 with President Keiko Fujimori.

  3. Ositrán reports 81.27% physical progress

    Milestone

    The supervisor's October report notes branch stations at 65% civil works, electromechanical systems at 13%.

  4. Micaela begins the Line 4 branch from Gambetta

    Construction

    After finishing its Line 2 portion, Micaela starts excavating the 8 km branch toward Carmen de la Legua.

  5. TBM Micaela starts boring at Puerto del Callao

    Construction

    The tunnel boring machine, named for independence heroine Micaela Bastidas, begins its run on Line 2.

Scenarios

1

Lima's first underground metro opens to passengers by late 2027

Possible Resolves by End of 2027

Discussed by: Peru's transport ministry (MTC), ATU, and project proponents

Tunnel excavation is done, but opening depends on finishing station interiors, electrical and mechanical systems, and railway equipment. On the Line 4 branch, Ositrán's October 2026 report put electromechanical installations at about 13% and railway installations at zero. A fast push on those systems could get trains running by late 2027.

2

Metro opening slips to 2028 as systems work lags

Likely Resolves by Q2 2028

Discussed by: Ositrán monthly progress data

Ositrán's October 2026 figures show branch civil works and architecture at 65% and the Carmen de la Legua interchange at 56%, with electromechanical and railway installations barely started. Systems work generally follows tunnel completion, so full service could slide into 2028 or later.

3

Phased opening: Line 2 core runs before the full Line 4 branch

Possible Resolves by End of 2027

Discussed by: Project observers and ATU

The operator could open the most complete segments of Line 2 first, then add the Line 4 branch once the Carmen de la Legua interchange is ready. ATU projects that station will move more than 24,000 passengers in peak hour, making it the natural hinge for any phased launch.

Historical Context

2 moments from history that rhyme with this story — and how they unfolded.

1988-1994

Channel Tunnel (1988-1994)

Eleven tunnel boring machines drove about 150 km of tunnels linking Britain and France beneath the English Channel, with the first undersea breakthrough in 1990. The rail tunnel opened in May 1994, roughly a year and a half behind schedule.

Then

The tunnel opened in 1994 and became the fixed rail link between the two countries.

Now

The project ran billions over budget and years late, yet has carried passengers and freight for three decades.

Why this matters now

Shows how multi-year TBM excavation precedes decades of service, and how even megaproject schedules stretch.

December 1913

Buenos Aires Subte Line A (1913)

Buenos Aires opened Latin America's first underground railway, Line A of the Subte, in December 1913 with British-built wooden cars.

Then

The line carried passengers immediately and became the core of a growing network.

Now

More than a century later, Buenos Aires operates one of the region's largest subway systems.

Why this matters now

Peru's first underground metro arrives about 113 years after the region's pioneer, underscoring how late Lima is adopting subterranean rail.

Sources

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