Added 2 minutes later
The little marker on the map shows the location where the Tear is buried. You look for a similar area on the territory and click on the shovel. Digging takes an entire turn. If the camera is oriented correctly, finding the Tear is a matter of minutes. However, I haven't reached that mission yet, but I haven't had any problems with Tears anywhere. The main thing is to return the camera to its original position.