Elon Musk Pushed Back on Our Reporting on His Houston Tunnels Plan. Experts Say His Comments Are Misleading.
by Yilun Cheng, Houston Chronicle ProPublica is a nonprofit newsroom that investigates abuses of power. Sign up to receive our biggest stories as soon as they’re published. This article is co-published with the Houston Chronicle and The Texas Newsroom as part of an initiative to report on how power is wielded in Texas. Billionaire Elon Musk is taking issue with a recent investigation by the Houston Chronicle and The Texas Newsroom that raised questions about a flood tunnel project he’s pitching to address Houston’s chronic flooding woes. But experts said his response, which he did not explain to the newsrooms, isn’t supported by facts or data. Last month, the newsrooms reported that Musk’s tunneling company, The Boring Co., has been lobbying elected officials for months to allow it to build tunnels under Houston for flood mitigation. Boring has proposed digging two 12-foot-wide tunnels beneath Buffalo Bayou — the main waterway running through central Houston — to carry stormwater out of neighborhoods and toward the Gulf of Mexico during major storms. Experts say, however, that larger tunnels, closer to 30 to 40 feet in diameter, could carry far more water and be more effective. Musk and representatives with Boring did not respond to interview requests or answer questions the newsrooms sent in advance of last month’s story about whether Boring’s smaller tunnels would be able to handle the scale of floodwater Houston is likely to encounter in the future. Instead, Musk waited until hours after the story published to post a response on X, the social media company he’s owned since 2022. “Boring Company tunnels will work and cost <10% of alternatives,” his Aug. 28 post read. “If more flow is needed, additional tunnels can be built and furthermore they can be route water from many parts of the city, not just one.” The post was written in response to a post on X from U.S. Rep. Wesley Hunt, a Houston Republican who helped arrange private meetings with government officials in Harris County and across the state to sell them on Boring’s flood tunnel plan. Hunt also did not respond to questions from the newsrooms ahead of publication of the original story, but he weighed in on X after the story was published. “A lifelong Houstonian and Texas Congressman spoke to the smartest man on planet earth about solving a generational flooding issue in our city that no one else will fix,” Hunt wrote. Musk’s post offered no data or engineering explanation to back up his assertions. So the newsrooms examined his statements, comparing them against flood studies, and interviewed engineering experts, some of whom pointed out key technical and logistical challenges with the Boring plan. One of Musk’s claims is likely false, and the others are not yet possible to verify with certainty, according to the newsrooms’ examination. Again, when the newsrooms pressed Musk and Boring representatives to explain the tech billionaire’s claims, they did not respond. Nor did Hunt. Houston’s Buffalo Bayou Park is visible from the roof of The Allen, a nearby condominium, in 2023. The bayou is the main waterway running through central Houston. (Kirk Sides/Houston Chronicle) Would Boring’s tunnels cost less than 10% of alternatives? Musk’s proposal carries a lower price tag than the estimated cost of the larger system the flood control district has spent years and millions of dollars studying. But that’s partly because the two are strikingly different proposals. Hunt’s team has said Boring’s Buffalo Bayou project would cost $760 million, according to internal communications obtained by the newsrooms through public records requests. The county’s flood control district, on the other hand, proposed in 2022 tunnels of 30 to 40 feet in diameter for that segment of the system at a price of about $4.6 billion. Since the project is still in the research phase, the county numbers are preliminary. But based on the figures available, Boring’s proposal would cost closer to one-sixth of the county’s estimate — not less than 10%, as Musk’s post suggested. So Musk seems to be exaggerating how much cheaper his system would be. Flood control experts also maintained that the reduced price is somewhat proportional to the reduced capacity of Boring’s narrower tunnels. Two 12-foot tunnels would provide less than one-fifth of the volume that a single 40-foot tunnel offers. That means they would divert less water from vulnerable areas than one large tunnel. Jim Blackburn, a Houston environmental lawyer and flood policy expert, said while Musk’s company deserves a fair hearing, cheaper does not automatically mean better. “If it’s a smaller tunnel, then I would expect it to cost less,” Blackburn said. “You’ve got to look at how much flood mitigation you get for the dollars you spend.” Emily Woodell, a spokesperson for the Harris County Flood Control District, said the agency needs more information before it can weigh in on any of Musk’s claims. “We’d have to do a lot of study before anything could even potentially move forward, so I wouldn’t want to speculate,” she said. “Until we have a project or another study, we’d point people to our website for the reports and data we’ve compiled to date.” Can additional tunnels be built for more water flow? Musk’s post said if more floodwater needs to be moved, more tunnels can be added. Engineers said it is not that simple. Larry Dunbar, a veteran water resources engineer who has advised Houston-area governmental agencies on drainage issues, said based on size alone, it would take about 11 of Boring’s tunnels to carry the same amount of water as one large tunnel. Lined up side by side, with enough room between them to keep the ground stable, the full system could span hundreds of feet. That would require securing rights to more land and building more access points for maintenance, he said. And each new phase of construction might bring another round of reviews and mobilization costs, Dunbar said, undercutting the speed and affordability that Boring has touted as key advantages of its proposal. “The issues start
