Implosive cavitation.
This explains many things in Nature, 'the galvanic effect' on an 'atomic' level to comets in space. The collapsing of these 'bubbles' or the implosion of 'gases' creates cavitation and ultrasonic vibrations. This process also produces light which we call today sonoluminescence with a huge release of 'blue implosive' energy, unlike today's explosive red energy.
Comets portray these characteristics from the light given off by them and their rough surface as they rotate and speed through space. The Rhine in Germany before it was forcefully re-routed was said to glisten with gold lights within the water, clearly due to this effect.
For an ancient technology understanding, view the work of John Cadman.
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