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Old October 24th 17, 07:50 PM posted to sci.space.policy
Fred J. McCall[_3_]
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Default Discovery of 50km cave raises hopes for human colonisation of moon

William Elliot wrote:

On Mon, 23 Oct 2017, Greg (Strider) Moore wrote:

It's funny you mention this. The first idea has been looked at for
cave rescue, but so far hasn't been done, at least routinely. It
may work better in lava tube because they tend to be straighter and
less mazy (but that's far from true too). But there's no guarantee
until we go.


Why not? More expensive than cables? On the other hand, for
twisting, winding, narrow caves, cables would be better, at
least for those portions.


I'm speculating, but I would expect wireless relays to have a lot of
problems with multipath reception ('echoes' from all the rocks and
crap in the cave). Of course, physical wires have the problem that
something actually needs to pay them out and not have problems with
reels and snags.


--
"The reasonable man adapts himself to the world; the unreasonable
man persists in trying to adapt the world to himself. Therefore,
all progress depends on the unreasonable man."
--George Bernard Shaw