Scientists Confirm First Massive Lava Tube on Venus Using NASA Radar Data

A Hidden Cavern Revealed by Decades-Old Data

Venus, Earth’s closest planetary neighbor, has long been shrouded in mystery—its thick, toxic atmosphere obscuring its surface from direct observation. But a team of researchers has now uncovered a subterranean lava tube in the planet’s Nyx Mons region, a finding that may redefine how scientists view Venus’s geology. The discovery hinges on a “skylight,” a collapsed section of the tube’s roof, which was identified in radar images captured by NASA’s *Magellan* spacecraft between 1990 and 1992.

The lava tube, described in a peer-reviewed study published February 9, 2026, in *Nature Communications*, is estimated to be about 1 kilometer in diameter, with a roof thickness of at least 150 meters and an empty void reaching 375 meters high. The conduit extends at least 300 meters from the skylight, suggesting it could be part of a much larger underground network. This is the first confirmed lava tube on Venus, a feature previously only theorized based on volcanic activity observed on the planet’s surface.

Lorenzo Bruzzone, a remote sensing scientist at the University of Trento in Italy and lead author of the study, emphasized the significance of the finding.

“Both spacecraft will carry advanced radar instruments capable of acquiring images of the Venus surface at significantly higher resolution than those currently available.”

Lorenzo Bruzzone, remote sensing scientist, University of Trento

Why This Discovery Matters for Venus’s Volcanic Past

Lava tubes are natural underground tunnels formed by volcanic activity, typically created when low-viscosity lava cools and solidifies on the surface while the molten rock beneath continues to flow. On Earth, these structures are well-documented, but their existence on Venus had remained speculative until now. The newly identified tube offers critical clues about the planet’s volcanic history—particularly the role of pyroclastic flows (fast-moving currents of hot gas and volcanic matter) in shaping its surface.

Venus lacks evidence of plate tectonics, a process that recycles Earth’s crust and drives geological activity. Instead, its surface is dominated by vast volcanic plains and towering mountains, with radar data suggesting ongoing volcanic activity. The lava tube’s discovery aligns with this picture, reinforcing the idea that Venus’s geology is driven by internal heat rather than tectonic shifts. As Bruzzone’s team notes, the tube’s structure—with its thick roof and substantial void—implies that Venus may have once hosted extensive volcanic systems capable of sustaining such large underground formations.

Moreover, the finding challenges assumptions about the planet’s stability. If lava tubes are widespread, they could indicate periods of intense volcanic activity, possibly linked to the planet’s runaway greenhouse effect. Understanding these processes is crucial for unraveling why Venus evolved so differently from Earth despite their similar sizes and compositions.

Upcoming Missions Will Probe Deeper

The discovery comes at a pivotal moment for Venus exploration. Two high-profile missions—NASA’s *VERITAS* and the European Space Agency’s *EnVision*—are set to launch before June 2031, both equipped with next-generation radar instruments designed to map Venus’s surface in unprecedented detail.

*VERITAS* (short for *Venus Emissivity, Radio Science, InSAR, Topography, and Spectroscopy*) will use synthetic aperture radar (SAR) to create high-resolution 3D maps of the planet’s topography, while *EnVision* will combine radar, spectroscopy, and other sensors to study Venus’s atmosphere, surface, and interior. Both missions aim to answer fundamental questions about the planet’s geologic and climatic evolution—and the lava tube discovery will likely shape their observational priorities.

Bruzzone’s team used advanced SAR imaging techniques to reanalyze *Magellan*’s decades-old data, a process that highlights the enduring value of archival planetary science. The skylight’s detection relied on identifying subtle surface collapses in the radar imagery, a method that could now be applied to other regions of Venus to search for additional lava tubes or volcanic features.

What’s Next for Venus Exploration?

The confirmation of a lava tube on Venus opens new avenues for research, but it also raises questions about the planet’s broader subsurface structure. Are there more tubes? Could they serve as potential sites for future robotic or even human exploration? While Venus’s surface temperatures exceed 460°C (860°F) and atmospheric pressure is 90 times that of Earth’s, its underground cavities might offer relatively stable environments—at least compared to the hellish conditions above.

For now, the focus remains on the upcoming missions. *VERITAS* and *EnVision* will provide the first detailed radar maps of Venus in over three decades, potentially revealing thousands of similar features. If lava tubes are common, they could become key targets for studying Venus’s volcanic history and even as potential sites for future landers or probes.

One certainty is that Venus is no longer the enigmatic twin of Earth. With each new discovery, the planet’s secrets are slowly unraveling—and the lava tube is just the beginning.

Key Takeaways

• First confirmed lava tube: Scientists identified a 1 km-wide lava tube beneath Venus’s surface using reanalyzed *Magellan* radar data, published February 9, 2026, in *Nature Communications*.
• Volcanic clues: The discovery suggests Venus may have had extensive underground volcanic systems, challenging assumptions about its geologic activity.
• Mission impact: NASA’s *VERITAS* and ESA’s *EnVision* missions, launching before June 2031, will use advanced radar to map Venus in greater detail, potentially uncovering more lava tubes.
• Future exploration: Lava tubes could become targets for studying Venus’s interior or even as sites for future robotic missions.