As the team enters, they start getting a bit of interference on their warp bands. This is definitely the area that's causing the disturbance, but it's not the core source.

Before leaving the city, you were all given beacons. These small, disc-like devices fit in the palm of your hand. If placed and secured near the area that is producing the signal, they will help neutralize the issue - but they must be secured in order to continue to do so. However, they must be placed near the source to be effective, so the team will have to explore deeper into the cavern.