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Updated: Apr 15, 2026

Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
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Bubble-induced cave collapse.

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Cave collapses in submerged limestone caves are not due to instability, but diver bubbles. Bubbles reduce buoyancy on ceiling rocks, causing them to fall, even in structurally sound caves.

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Area of Science:

  • Geology
  • Fluid Dynamics
  • Cave Diving Safety

Background:

  • Submerged cave collapses are often attributed to natural instability or diver contact.
  • Conventional wisdom suggests limestone caves grow unstable with size.

Purpose of the Study:

  • To investigate the role of diver bubbles in triggering submerged cave collapses.
  • To assess the structural stability of submerged limestone caves.

Main Methods:

  • Applied beam strength theories to model cave ceiling stability.
  • Analyzed bubble dynamics and fluid flows induced by divers.
  • Conducted laboratory experiments simulating bubble-induced rock falls in model caves.

Main Results:

  • Calculations show submerged cave ceilings can be stable up to 63m (flat) or 240m (arched).
  • Diver bubbles, by reducing buoyancy on ceiling rocks, can trigger collapses.
  • Laboratory experiments qualitatively demonstrated bubble-induced rock detachment.

Conclusions:

  • Submerged limestone caves are likely more stable than conventionally believed.
  • Diver-generated bubbles are a plausible cause of observed cave collapses.
  • Cave diving practices may need re-evaluation to mitigate collapse risks.