Tunneling
$2 billion, 20-story-deep DigIndy tunnels complete in Indianapolis
Indianapolis has completed the $2 billion DigIndy Tunnel System — a 28-mile network running 20 stories underground — to capture stormwater and sewage overflows, improving water quality and protecting the White River.
Gateway Commission extends $665 million contract for Hudson Tunnel Project
The Gateway Development Commission has extended MPA Delivery Partners’ contract by $665 million to continue managing the Hudson Tunnel Project, advancing construction of twin rail tunnels beneath the Hudson River and rehabilitation of the existing 115-year-old tunnel.
Topcon, Amberg launch integrated solutions for tunnel construction and surveying
Topcon and Amberg Technologies unveiled new integrated tunnel construction solutions at INTERGEO 2025, combining advanced positioning and measurement systems to improve accuracy, automation, and data workflows in underground infrastructure projects.
Skanska-Fay JV completes $450 million Baltimore tunnel project two years early
A joint venture between Skanska and Fay, S&B USA Construction, has achieved substantial completion of CSX’s $450 million Howard Street Tunnel Modernization Project in Baltimore—nearly two years ahead of schedule.
U.S. freezes $18 billion in funding for NYC tunnel, subway projects amid shutdown
The Trump administration has halted roughly $18 billion in federal funding tied to two of New York City’s largest transit infrastructure projects — the long-delayed Hudson River rail tunnel and the expansion of the Second Avenue subway.
TxDOT advances massive drainage tunnel beneath I-35 in Austin
TxDOT is advancing one of Austin’s largest tunnel projects—a 6.5-mile, 22-foot-wide drainage tunnel beneath I-35. The massive system, built with German tunnel boring machines, will keep new sunken lanes from flooding and send stormwater to the Colorado River.
Cleveland, Ohio sewer district passes halfway mark on $3 billion tunnel program
Cleveland’s $3 billion Project Clean Lake is more than halfway complete, with deep-rock storage tunnels already cutting sewage overflows into Lake Erie by 2 billion gallons annually.
Is the Boring Company tunneling blind in Nashville? Experts warn rock tests fall short
Elon Musk’s Boring Company plans just five soil borings for its Nashville tunnel project, far fewer than experts recommend. Geologists warn the limited testing could mean tunneling blindly through the city’s fragile limestone terrain.
U.S. DOJ defends Enbridge’s Line 5 pipeline in Michigan dispute
The U.S. Justice Department has filed a statement of interest backing Enbridge in its fight with Michigan over the Line 5 pipeline, arguing the state overstepped federal pipeline safety authority and interfered with U.S.–Canada treaty obligations.
Jacobs, Rambøll to lead design of Denmark’s Marselis Tunnel
Jacobs and Rambøll have been tapped to design and manage the Marselis Tunnel in Aarhus, Denmark, a key infrastructure project linking Aarhus Port to the E45 Motorway and easing heavy traffic through the city.
Newsom's Delta Tunnel project faces setback as fast-track bills die in legislature
California’s Delta Conveyance Project suffered a major setback last week after two fast-track bills died in committee. Gov. Newsom’s $60–100 billion water tunnel has faced growing opposition over costs, environmental risks and community impacts.
Elon Musk’s Boring Company halts Vegas Loop tunneling after worker injury
A worker suffered a “crushing injury” inside a Boring Company tunnel near the Las Vegas Strip, prompting officials to pause work on the Vegas Loop project while the incident is investigated.
Vancouver nears completion of $208 million water tunnel
Metro Vancouver is making progress on its long-term water security initiatives, with excavation for the Annacis Water Supply Tunnel nearing completion. The 1.43-mi steel main is part of a $208.1 million project awarded to Traylor Aecon General Partnership, with full completion expected by 2027.
Northern Michigan lawmakers back Enbridge Line 5 tunnel project
Northern Michigan lawmakers have renewed support for Enbridge’s Line 5 tunnel project, calling it vital to jobs, energy supply, and Great Lakes protection, while urging regulators to fast-track approval.
Miami Beach may study underground transit tunnels to ease congestion
Miami Beach officials will explore whether underground transit tunnels could reduce congestion, tasking the commission with studying technical feasibility, funding, and integration with existing systems.
Musk-backed $760 million Houston flood tunnels draw political support, engineering doubts
Elon Musk’s Boring Co. is pushing a $760 million plan to build smaller flood tunnels under Houston with the backing of Rep. Wesley Hunt, but engineers question whether the design can handle the city’s massive stormwater needs.
St. Louis, Mo., hides four miles of River Des Peres in tunnels beneath Forest Park
Hidden beneath Forest Park, St. Louis's River Des Peres flows through four miles of century-old tunnels. MSD plans a deeper, expanded system to handle growing wastewater and stormwater needs.
Line 5 Tunnel Project faces scrutiny over 'lacking' environmental impact assessment
Michigan environmental groups have called for a more comprehensive review of the Line 5 Tunnel proposal, citing concerns that the state is not fully assessing its environmental impact. The Department of Environment, Great Lakes and Energy (EGLE) confirmed that their analysis does not include the effects of tunneling through the Straits of Mackinac.
Pittsburgh’s $3.5 billion ALCOSAN tunnel project breaks ground after decades of delay
Pittsburgh has initiated construction on ALCOSAN’s $3.5 billion wastewater tunnel system, starting with a $800 million, 3.8-mile tunnel under the Allegheny and Ohio rivers.
Houston considering new underground tunnels for flood mitigation
Harris County in Houston, Texas, is exploring substantial projects to mitigate flooding, including the construction of tunnels over 100 feet below the water. Over the past six years, the flood control district has invested $4.5 million in tunnel studies, partially funded by a federal grant.
MTA awards $1.97 billion tunnel-boring contract for subway expansion
New York's Metropolitan Transportation Authority (MTA) Board has awarded a $1.97 billion tunnel-boring contract for Phase 2 of the Second Avenue Subway project. Connect Plus Partners, a joint venture between Halmar International and FCC Construction, will conduct tunnel boring between 35 and 120 feet below Second Avenue using 750-ton machines equipped with 22-foot drill heads.
VTA plans single tunnel for BART extension in bid to save $600 million
The Valley Transportation Authority has finalized its decision to build a single tunnel for the BART expansion project in San Jose, Calif., after years of debate regarding the construction of either one or two tunnels. Project officials have presented a cost report detailing up to $600 million in savings with the decision.
Tunnel boring continues under Chesapeake Bay for $3.9 billion HRBT Expansion project
The second phase of tunnel boring work beneath Virginia's Chesapeake Bay is excelling at a rapid pace, according to project officials. The Hampton Roads Bridge-Tunnel (HRBT) Expansion project is a multi-year, $3.9 billion infrastructure overhaul led by the Virginia Department of Transportation.
Aecon-led team lands $1.4 billion contract to build twin subway tunnels in Toronto
A $1.4 billion contract has been awarded to North End Connectors to design and build twin tunnels for the Yonge North Subway Extension. Major construction is expected to start following design completion.
California tunnel project nears construction with $200 million accountability plan
The Newsom Administration introduced a $200 million plan to support Delta communities and boost transparency as California prepares for construction of the Delta Conveyance Project.
Tennessee OKs land lease for Elon Musk’s Nashville tunnel project amid public pushback
Tennessee’s State Building Commission approved a free lease of state land for Elon Musk’s The Boring Company to begin work on the 10-mile Music City Loop tunnel—a critical step in infrastructure staging and project mobilization.
LA tunnel work at 'full stop' following collapse, ongoing investigation
Construction work on an LA wastewater tunnel project remains paused following a partial collapse earlier this month in which nearly 30 workers were trapped, and later rescued.
W.A. Rasic Construction wins major subcontract for $630 million LA tunnel
W.A. Rasic Construction has been selected by Dragados USA to install 144-inch pipeline segments for the $630 million Joint Water Pollution Control Plant Effluent Outfall Tunnel in Los Angeles County, enhancing regional wastewater infrastructure and seismic resilience.
Portland begins 3-year replacement of 90-year-old Carolina Trunk sewer under I‑5
Portland has started a multi-year project to replace the 90-year-old Carolina Trunk sewer under I 5. The work involves tunneling, excavation, and open-cut construction to modernize a key storm and sanitary line serving Southwest Portland.
Tunneling begins in Auckland for $69 million wastewater project
Watercare, New Zealand's largest water utility, has begun tunneling work to lay a new wastewater pipe as part of its Midtown Wastewater Diversion project. Watercare's micro-tunnel boring machine (m-TBM) began boring a stretch under Auckland's Queen Street that will span nearly 2,000 ft (600 m).
- Three Houston workers killed by hydrogen sulfide leak during sewer repair
- Trump's tariffs drive $33 million cost increase for Cincinnati sewer project
- TxDOT advances massive drainage tunnel beneath I-35 in Austin
- Funding approved for $1.3 billion, 60-mile water reuse system in southern Utah
- Is the Boring Company tunneling blind in Nashville? Experts warn rock tests fall short