The conch would not have made a sound, and what is heard is mainly the sound of blood circulating in the ear.

The sound can be heard in the conch mainly because of the *** vibration.

According to physics, if the frequency of a vibration or sound from outside the conch is the same as the frequency inherent in the conch's internal cavity, *** chirping occurs. The *** chirp amplifies the sound. When we listen to a conch by holding it to our ears, we hear this ****ing, or amplified sound. In fact, it's not just the conch; we can hear the same *** chirping when we clasp a cardboard box or empty hot water bottle to our ear.

And the source sound that produces the **** chirp is primarily the sound of blood flow.