The audio titled "Final Ping Sound" begins with the high-pitched, metallic sound of a laser, fired from an unseen source. Then, the sound of a metal object dropping is heard, the echo resonating as if in a large, empty missile silo. The object seems to fall for a while, continuously descending into the unknown depth of the silo. The noise of falling is abruptly followed by a bouncing sound, creating a rhythm that is amplified by the echo. It's as if the dropped object has hit a hard surface and is now bouncing repeatedly. The series of bounces gradually decrease in frequency and intensity, representing the object's loss of momentum. The audio culminates with a final, loud, and clear ping, signifying the last bounce before the object comes to a complete stop. The echo of the final ping slowly fades away, leaving a chilling silence behind.