The audio commences with the distinct sound of a knock against a thick wooden door. The knock echoes, illustrative of the solidity and depth of the wooden door. The rhythm of the knocking is steady and consistent, echoing the typical pattern of a person knocking on a door to gain attention. The sound of the wooden door being knocked is rich and resonant, a testament to its robust and thick nature. The knocking continues, a repetitive yet attention-grabbing sound that fills the audio recording. It's a sound that can't be mistaken, the clear and tangible knock against a heavy, wooden door.