Glider Driven by Soft Solid-state Buoyancy Engine

Test footage of a robotic buoyancy glider driven by the expansion of phase-change ethanol-elastomer composite.
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[@karthikeyana2823]

Here before this video hits millions
It currently has 485 view ;)

[@nosidenoside2458]

What is it

[@flaparoundfpv8632]

Why the hell won't you explain it?