An item located at the large wreckage sites. Its appearance and composition indicate a common origin with the unknown artefacts and probes found in the Merope region.
— In-game Description
The Thargoid Link, formerly known as an Unknown Link, is a Thargoid object that can be found in a Thargoid Surface Site. It drops from the ceiling if you have a Thargoid Sensor in the cargo bay of your SRV. It is necessary in order to activate the Unknown Device inside a Surface Site.
Thargoid Links can also be used to locate new Thargoid Surface Sites. After an Unknown Device has been activated and its three Unknown Signals acquired, take an Unknown Link to space and deploy it, then play a Signal while nearby. The Thargoid Link will react to each Signal and point in the direction of a new Site.