A mysterious low frequency hum plagues geographic hotspots around the world. Is something beyond our understanding trying to reach out to us? Surrounded by an invisible sphere of data, our understanding of the universe depends on signals sent and received. Yet, occasionally, we experience a phenomenon of unknown signals. Phantom Signals explores several strange signals, investigating all possible angles in the hopes of finding an answer. From an infamous Soviet cosmonaut’s last communication to mysterious cries for help over radio, these fascinating mysteries come from all corners of the universe to alert us to what might really be out there.