Inside the world`s quietest room

"An anechoic chamber in Minneapolis's Orfield Laboratory holds the Guinness world record for the world's quietest place at -9.4 decibels.
As humans can only detect sounds above 0 decibels, the chamber is virtually soundless. The room consists of a mesh floor, walls lined with meter-long sound-proofing wedges, and a meshed ceiling. People inside the chamber can hear their own stomach, heart, or even ears, as the ear makes its own noise when it does not detect sound."

hearing your own ears make noise would be quite puzzling

Source: Minnesota Public Radio