Find the artefact is one of the more enjoyable Uncharted/Tomb Raider style treasure hunts in Far Cry 6. You will need to swim into a cave and try to solve the mystery to find a hidden artefact.
Check out the video guide below and it will show you how to complete the find the artefact treasure hunt in Far Cry 6.
How To Disable The Electricity
If you follow the main wires that are coming from the cavern, it will lead you to a red generator. Destroy the pallet that is leaning up against it to expose a connector. Disconnect this cable from the generator and the electricity will be disabled down in the cave, allowing you to swim into the water unharmed.