Episode 258: Julia — The Voice Beneath the Pacific 🌊👁️ In 1999, NOAA hydrophones captured a mysterious ultra-low-frequency sound deep beneath the Pacific Ocean. When sped up, the signal—dubbed “Julia”—takes on an eerie, human-like quality that has unsettled listeners for decades. 🐋📡 In this episode of The Shadow Frequency, we explore the chilling recording, the official iceberg explanation, the science of underwater acoustics, and the unanswered questions that still linger beneath the waves. 🌊👻 🔗 More episodes & merch: shadowfrequencypodcast.com 🕒 Runtime: 20m 02s | 📅 Air Date: December 13, 2025