In the audio titled "Door Unlocked", the prominent sound is that of a door being unlocked. You can hear the scratchy noise of a key being inserted into a lock, turning with a soft metallic click. There's a sense of anticipation as the key turns, and the subsequent release of the door mechanism is clear and distinct. The creak of the door as it swings open adds a touch of drama, and the slow, groaning sound resonates, suggesting the door hasn't been opened in a while. The final thud as the door fully opens signals a new threshold crossed, a new space entered. The silence that follows is filled with the promise of what lies beyond.