Entertainment
Hollywood vs. Reality: How LA’s Wilshire Subway Was Really Built
Wilshire Subway: Did LA blast subway tunnels under Wilshire Boulevard? Hollywood says yes — engineers say no. Here’s how Metro safely tunneled beneath Miracle Mile.
When the 1997 disaster film Volcano depicted lava erupting along Wilshire Boulevard and referenced blasting during Red Line subway construction, it delivered gripping cinema — but not accurate engineering.
In reality, Los Angeles Metro did not rely on large-scale blasting to construct subway tunnels beneath Wilshire Boulevard and the Miracle Mile. Instead, engineers used tunnel boring machines (TBMs) specifically to avoid the very risks Hollywood dramatized.
Why Blasting Was Avoided
The Wilshire Corridor sits atop historic oil fields, making methane gas pockets a known and serious concern. A deadly methane explosion near Fairfax Avenue in 1985 led to heightened scrutiny of underground construction in the area. Blasting in such conditions could have caused unpredictable gas releases, ground instability, or damage to surface structures.
As a result, Metro engineers chose pressurized, closed-face tunnel boring machines, which allow for:
Controlled excavation in dense urban environments
Continuous ground support to prevent settlement
Integrated gas detection and ventilation systems
These machines grind slowly through soil and rock while installing precast concrete tunnel linings, creating a sealed, gas-resistant structure as they advance.
The Real Engineering Feat
Although Volcano took creative liberties for dramatic effect, the true story of tunneling under Wilshire is no less impressive. Advances in TBM technology and methane mitigation ultimately allowed the Metro D Line (formerly the Red Line/Purple Line) to safely pass through one of Los Angeles’ most geologically complex corridors — without explosions, collapsing streets, or cinematic chaos.
Bottom Line
Volcano remains a memorable piece of 1990s disaster cinema, but its portrayal of subway construction is fiction. The real achievement lies in decades of careful planning, modern tunneling technology, and engineering solutions that quietly reshaped Los Angeles beneath its busiest boulevard.
Related Links:
- LA Metro – D Line (Purple Line) Extension Project
- Engineering News-Record: Tunneling Through Gas and Tar in LA
- Los Angeles Times Archive: Methane Risk and Subway Construction
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