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Extending tether up to 4km

Hi everyone,
I found a tweet regarding 2km aquaduct inspection. I would like to know the tether technology used here.
I am also looking to extend my tether length to a distance of 4km . Can anyone please help me to explain tether extending technology?

Thanks
-sudheesh

Most likely fiber optic I would imagine. There are a few posts on here on how to do it. Prices have come down considerably and it is not technically challenging to do yourself.

1 Like

Hi @sudheeshk,

Here’s a relevant forum search link. This post looks to be particularly relevant, but others there likely are too.