To create a Zip-Line, load an Anchor into a Crossbow and fire at any surface within a reasonable distance. Immediately afterwards, fire another Anchor at a spot above or below the first Anchor to create the Zip-Line between the two anchors.
When firing the second Anchor, a dot indicates where the zip-line can be created. If the dot is green, a zip-line can be created between the first anchor and the target point, if the dot is red, the zip-line can't be created between these points.
Anchor points can be placed under water but the line cannot be mounted under water. You can use a zipline that has one anchor under water but you are detached from the line upon entering the water, even if using the Zip-Line Motor Attachment.
To descend a zip-line, press E, , while standing at the top of the zip-line. To ascend a zip-line, you need to use a Zip-Line Motor Attachment.
Your view is fixed in the forward direction and you cannot use weapons while using a zip-line unless you are using the Zip-Line Motor Attachment.
You can jump while on the zip-line to detach and boost yourself upwards. This means that the end of your zip-line can be at the top of the side of a cliff or structure and you can get on top of the cliff or structure.
Creatures on Zip-Lines
Ravager can climb on zip-lines, unless the zip-line is too steep (both upwards and downwards). Similarly, Gigantopithecus can climb on zip-lines, but cannot jump towards other nearby zip-lines; it has to be at land to jump onto any climbable zip-lines.