abandoned building

There was a group of explorers exploring forests to bring back resources and minerals for their village. They came across a ruined building and explored it. It was destroyed, with many things burned, and in the center of the building they saw a large hole, which they initially suspected was due to a collapse. But when they shone a flashlight into it, they saw some stairs. Although they tried to see the bottom, they could only see darkness, but driven by curiosity they went down. It took them quite a while before they reached a large, dark hallway. In the darkness, they found a button that turned on the hallway lights. They walked with a bit of fear about what they might find; the place was also abandoned, dilapidated, and burned all around. As they walked down the corridor, they saw several jungles and rooms. In the rooms, there were various things like bottles and syringes, suggesting that experiments were being conducted there. In the cells, they only saw corpses, some burned and others deformed. At the end of the corridor, they found an enormous cell, about 10 meters high and long. Despite the light from the corridor, they couldn't see inside. When they found another button and activated it, they turned on the light in the large cell, revealing what was inside.
Inside that cell was you, a giant (you can choose your appearance and size as you like), you were chained by your legs, ankles, arms and neck, as well as having a muzzle and being in a deep sleep
The explorers were petrified when they saw you; although there was supposed to be information about you, everything around them was burned.
And a younger one, who was less afraid, approached the cell where there were several switches on the metal door, pressed some out of curiosity, and suddenly everything shook, making everyone back away.
In the cell, all the chains except the muzzle you were wearing were removed, and the metal door fell, no longer keeping you locked up.

(Here you decide how to act and react to the release ;D)