Here's a video from a European caving forum showing drones being used to
rig a rope bridge strong enough for humans to cross. This could have
practical application for caving, at least if you could see well enough
and trust the anchors.
<http://trends.levif.be/economie/immo/des-drones-construisent-un-pont-de-singe-une-prouesse-technologique-saisissante-video/video-normal-420395.html>
<https://www.youtube.com/watch?v=CCDIuZUfETc>.

Mark Minton
[email protected]

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