A group of friends go hiking in the mountains and come across a mysterious cave hidden deep in the forest

A group of friends go hiking in the mountains and come across a mysterious cave hidden deep in the forest. Intrigued, they decide to explore inside despite feeling a sense of unease. As they venture further into the cave, they uncover ancient markings on the walls and strange artifacts scattered throughout. Suddenly, they hear a low rumbling sound coming from deeper within the cave, sending shivers down their spines. What will they discover next in the depths of the mysterious cave?