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Brazil's contract belongs to Mota-Engil, a Portuguese builder — China's CCCC only reaches the project through its 31% equity stake in that company, not through any deal with Brasília.
- Official crossing-time estimates have moved: federal materials promised a two-minute ride in September 2025; by the January 2026 signing, state figures had grown to "under five minutes."
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Cost estimates diverge too — Mota-Engil's own market disclosure cited roughly R$8 billion, while government communications before and since have consistently landed closer to R$6.8 billion.
Latin America's first underwater tunnel is inching from paperwork toward pavement, and one name attached to it is a Chinese state-owned construction conglomerate. The arrangement, though, is narrower than that framing suggests.
A Corporate Bridge, Not a Government Pact
China Communications Construction Company has no contract with Brazil. Its link runs through ownership: CCCC's Dutch holding vehicle, Epoch Capital Investments, held a 31% stake in Mota-Engil as of an April 2026 regulatory filing, trimmed down from 32.41% after a share sale that month. Mota-Engil, the Portuguese construction group, is the party that actually signed on to design, build, operate and maintain the crossing linking Santos and Guarujá, two cities split by the channel feeding Brazil's busiest port.
How Mota-Engil Landed the Job
Mota-Engil's local subsidiary beat Spain's Acciona Concesiones at a September 5, 2025 auction at São Paulo's B3 exchange, offering a 0.5% discount off the government's maximum allowable annual payment of roughly R$438.3 million. After the concessionaire asked for extra time to set up the special-purpose entity required to formalize the deal, Governor Tarcísio de Freitas and Mota-Engil signed the public-private partnership contract on January 28, 2026, at the Palácio dos Bandeirantes. Freitas called the crossing part of "the future of Baixada Santista."
Two Minutes, Five Minutes, or Somewhere In Between
Announcing the auction result in September 2025, the federal government's own Casa Civil press office promised the crossing would shrink to "just two minutes," down from a ferry ride averaging 18 minutes before delays, or a roughly 40-kilometer road detour that can eat up an hour. Four months later, at the contract signing, the language coming from the São Paulo state government had moved: Acessa reported officials now pointing to up to five minutes, and the project's own tracking site today advertises a crossing of under five minutes. The shift likely reflects early traffic modeling giving way to more conservative numbers as engineering work matured — but it means the flagship statistic behind this project has moved by a factor of two or more, depending on which official release is being read.
Concrete Modules, Not a Boring Machine
Rather than tunneling through bedrock the way a subway line would, engineers plan to use the immersed-tube method: precast concrete sections built in a dry dock on land, floated into position and sunk into a trench cut across the seabed. The technique is established in the Netherlands, Japan, South Korea and China but has never been used in Brazil, according to São Paulo's Secretariat of Partnerships and Investments. The finished crossing will run 1.5 kilometers end to end, with 870 meters of that sitting roughly 21 meters below the port channel, per Gazeta de São Paulo. Six traffic lanes — three each direction — will share the space with a dedicated light-rail corridor, a bike path and a pedestrian walkway.
A Price Tag That Keeps Moving
Cost figures show a similar drift. Days after the auction, Mota-Engil told CNN Brasil and other outlets that total project investment would run roughly R$8 billion, with as much as R$5.8 billion coming from public coffers split evenly between the federal and São Paulo state governments and the remainder funded by the company itself. Government communications have told a leaner story from the outset: the Casa Civil's own September 2025 release cited R$6 billion, and by August 2026 Correio de Minas and other outlets were consistently citing a total closer to R$6.8 billion, with public funding near R$5.1 billion and Mota-Engil's share around R$1.7 billion. Neither side has publicly reconciled the gap.
Financing has hit its own turbulence. São Paulo's government signed a R$2.5 billion, 23-year credit line with Banco do Brasil in April 2026, backed by a federal guarantee, with Vice President Geraldo Alckmin estimating a 48-month construction window once building begins. The federal share of that backing briefly stalled: Brazil's federal audit court, the TCU, froze part of the disbursement with a precautionary order in March 2026, only clearing a further R$2.6 billion in May 2026 once its concerns were addressed.
A Contractor With Baggage
Mota-Engil's selection for a marquee Brazilian project hasn't escaped scrutiny of its own record. In Portugal, company founder António Mota and his sister agreed in 2016 to pay prosecutors roughly €6.1 million to resolve a tax-fraud investigation first opened in 2009, a settlement that closed the case without a criminal conviction. In Malawi, the company drew criticism after local media and a member of parliament produced records showing it had deposited checks worth up to roughly $40,000 at a time into the personal account of then-president Bingu wa Mutharika during 2010 and 2011, payments critics linked to government road contracts. A separate 2018 investigation found the firm held nearly ten times the value of Malawian road contracts as its nearest competitor. Mota-Engil has denied wrongdoing in both matters.
A Second Chinese-Linked Crossing, and a 2031 Target
Officials have leaned into the milestone framing regardless. Santos Port Authority president Anderson Pomini described the contract as bringing a "hundred-year dream" closer to reality when the auction closed. If the current schedule holds, 2026 is dedicated to finishing engineering plans, mapping land for expropriation and clearing remaining permits, with module fabrication penciled in for 2027, assembly running through 2029 and 2030, and commercial operation beginning in 2031, according to the project's official schedule.
CCCC is chasing a similar deadline elsewhere in Brazil. Alongside China Railway 20th Bureau Group, the company is building the roughly R$10 billion, 12.4-kilometer Salvador-Itaparica bridge in Bahia, also aiming for delivery in 2031. Together, the two projects trace a pattern: Chinese state capital reaching Brazilian infrastructure less through direct government contracts and more through equity stakes and construction consortiums — a route that keeps Beijing's fingerprints one step removed from the public paperwork.
