This is the kind of technology that I have envisioned for decades to be used to explore cavern areas. Notice especially the micro quadcopter for delivery, of which a swarm of those could be themselves used to do the bulk of the exploration:
Researchers at the Beihang University in Beijing have invented a 2-centimeter-long microbot with ultrafast untethered running speeds.
The research results were published in a study titled "A Wireless Controlled Robotic Insect with Ultrafast Untethered Running Speeds" in journal Nature Communications. Resembling a bug, this innovative robot has the potential for future applications in emergency rescue and mechanical inspection.
Video source: Beihang University / CGTN
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