I was searching for an antiquity on the prison island in High Isle. In the first attempt I successfully destroyed the antiquity (

), so I got a new location. But this location lies in the massive stone wall:

When you scan from the tunnel on the left, the blue flying pointer (what is the name for this thing ?) is pointing into the wall, so that the antiquity has to be somewhere in the wall.

Can I somehow remove this lead and start over again ?