https://www.bbc.co.uk/news/business-55191623

Used by Network Rail apparently, partly to survey caves close to railways.

They might consider just asking cavers . . . ?    :-\

I'd say that you are certainly at the "athletic" end of the caving physique spectrum Pitlamp (and I am more of the "kebab" end) but even you would strugglre to get down a 15cm inspection borehole!

I get the idea a lot of these are "enclosed" cavities underground and so would require digging to get a caver in.

Pitlamp said:

https://www.bbc.co.uk/news/business-55191623

Used by Network Rail apparently, partly to survey caves close to railways.

They might consider just asking cavers . . . ?    :-\

Click to expand...

It was actually done in Snailbeach Lead Mine just before the bats hibernated  and very early days

Mike

One advantage of a drone of course is that it doesn't mind bad air. Most cavers I know conk out around 14% Oxygen.

Chris.