If 2/3 = “tooth,” then Panama’s Metro Line 3 is grinning wide—but there’s still that final bite to come. As of late 2025, the tunnel under the Panama Canal is about 63 % complete, a milestone both enormous and humbling.

Body

• The tunnel is ~4.5-4.8 km long, ~13.5 m in diameter, 65 meters below sea level beneath the navigation channel. The TBM has already made history by crossing under the Canal’s traffic lane.

• Overall project progress (raised structures, elevated viaducts, stations) is moving rapidly. Many station shells and elevated supports are in advanced stages. But finish-work, safety systems, and integration still lie ahead.

• Timeline: partial finishes might happen sooner (non-tunnel parts), but full operation likely in 2027-2028, with the promise by leadership to complete during the current presidential term (by 2029).

• Impact: commute time slashed, traffic congestion eased, a modern connection between Panama City and its western suburbs. Also, an engineering milestone for Latin America.

Conclusion

So yes  come see this in another year or two, and you’ll see the bulk of the “tooth” set. But to get the smile complete — the last third — you’ll want to wait a bit more. Because when it’s done... it won’t just be an infrastructure marvel. It will be living proof of forward motion, of what a city can build when its gaze is on the horizon.

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