7 Mariana Trench Facts – Deepest, darkest, and most mysterious place on earth

Mysterious sounds

The Mariana Trench is not only visually intriguing but also audibly. In 2016 scientists recorded a mysterious sound coming from the Trench. This sound, known as the ‘bio-duck’ sound, sounds like a rapid series of pulses. The exact origin and meaning of this sound remain a mystery to researchers.