A couple of years ago, we went to Key West's oldest cemetery and took a walk around. As we entered this one section, things took a wrong turn.

I, Shaun, got sick to my stomach and one of my team members walked back to the car with me. As, I got further away from that area, my pain eased up considerably.
We received a call on our 2-way radio, from two team members that they were drawn to this one gravesite. It was the grave of a mother and newborn baby (the dates explained that).

My team member and I walked to where they were standing and they began conducting voice recordings. Now, when we record, radio silence is mandatory and all radio communication was shut down.

As one of the team members began to speak and ask questions, we got replies from the 2-way radios. It sounded like a child's voice and it was responding to what was being said.

We ruled out the idea that maybe it was some kind of interference from another wave source. How could anyone know what questions we were asking and reply to them as they were asked, if we weren't pressing the the "TALK" button on the radio?