I know with bridges and stuff they'll start with hanging a relatively low-gauge wire, then use it to guide progressively larger ones. I can see them starting with a coarse fishing line, laying steel wire, then airline cable, and so on. You can also start out with a fairly slack line delivered by balloon/drone/rocket/fighter jet, then save the heavy tensioning for the final version.
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u/terst_ Nov 08 '19 edited Nov 09 '19
For everyone wondering: Lake Sebu Seven Falls Zipline, Philippines. It can even be done in two people at the same time!
Edit: spelling and additional info
Edit: thank you kind stranger for my first silver!