[2021] How the hell isn't Erewhon discovered?

Yeah, there's some camouflage netting on the hole of the cavern, but the way there are vehicles parked next to an obviously large landing pad and how people be going in an out of a spesific location must mean there's something important to be investigated.

And considering how frequent the drone patrols are on the island, it's amazing that Erewhon wasn't discovered. And considering how Ian Blake kept an eye on everything, even Jace Skell and Walker, it's weird how he wasn't able to locate Erewhon.

There should've been a set of missions where Sentinel discover Erewhon, they go to attempt to raid Erewhon, but Nomad stops them and also manages to erase all evidence of Erewhon's presence from Sentinel.