These noises, they sound just like the echoes of Sentinel events. You've seen them before, of course. Drones that appear

These noises, they sound just like the echoes of Sentinel events. You've seen them before, of course. Drones that appear from nowhere if you interfere with their precious planets. But this data, it's distorted, inverted...

There's a lot to gain if we figure out how the Sentinels appear so quickly. And this, the portals? Perhaps they're the key.