so i had a think and there are only 4 possible ways that all the sensors went down:
1: the cabal attacked them, but this seems odd how did they sneak into the tower... Maybe the sions (however u spell that) did some telekinetic thing ?
2: lysander had agents switch them off but then icora says "there not there" which indicates they are destroyed or vanished
3: the speaker deactivated them, but theres no motivation for this and even so they are not there
4: my tinfoil hat personal favorite theory the cabal stole vex tec, i mean think about it how else did they trap the traveler? yes they sent some kind of vex devise to pull the sensors out of reality or something.
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I thought the sensors were beyond the wall Destroy sensors. Simple