Hello, I have been searching around the absolutely stunning caverns under the castle and managed to find all the artifacts but one, namely tthe Artifact of the Depth.

Apart from that one I could find the following artifacts at the following locations:

Shadows: 19.9 | 41.4
Stalker: 23.7 | 45.5
Lost: 22.2 | 41.2

Could anyone tell me where to find the last one (Depth)?