(From MC's perspective)
Underground chamber,
I spotted a narrow hole that leads to the surface. Seeing that, I confirmed Eric must have come from here. Other than that there is no other entrance/exit to this underground chamber.
The narrow hole is like another secret path that leads to the surface. My eyes gleamed with a twinkle. I already searched the nook and corner of this place.
There are no more books and other experimental stuff. Every other lab equipment got eroded over time. Finally, I decided to leave. Before leaving there is one more thing to take care of.
I can't leave the corpse here. There is a mutated forest ahead. It's better to dump the corpse there. After figuring it out, I picked up the cold corpse and moved toward the narrow hole.
A few minutes later,
I got back to the surface. My gaze turned towards the ruin. I don't know what is happening out there. But in a few hours, the sun is going to rise.