You can. Here is a video with an experiment. https://youtu.be/mXVGIb3bzHI
If there is at least someone alive in the room, there will be sound, the sound of the heart, blood, voice, creak of identity and joints.
A room where sound is muffled is called an anechoic chamber. All measures during its construction are aimed at eliminating sound reflections from walls, floors and ceilings. These chambers are designed for acoustic measurements so that reflections do not interfere with the result.
In real life, when talking, listening to music or watching a movie, we get 60 - 70% of direct sound and 40 - 30% of reflected sound. Our brain, which processes sound information, is tuned precisely to these ratios, and when there is no reflected sound, the "program" inherent in nature begins to fail. The sound seems dry, the voices lifeless, and the silence presses so hard that your head starts to ache. For safety reasons, the time spent by those. personnel in such cells is strictly limited.
Normally, a person is surrounded by various sounds. Even in a dream, humanity arrives in a certain background noise. Some have more, some have less. Including when we are in a state of rest, solitude, etc. Sounds are an integral part of our life at the physiological level.
Now imagine: a person who has spent his whole life with a certain background noise, is deprived of what -or sounds. The only thing he can hear is his own voice. The sense of space and time is lost, the person is disoriented. At this moment, a tremendous pressure is exerted on his psyche.
In this state, 30 minutes in absolute silence is an achievement, not otherwise.