Jounrey to the Deep Dark-prologue/lost

Thump-thump
Thump-thump
Thump-thump
"Don't go down there, it's way too dangerous!"
"This is the biggest score of our lives! We can't just back out!
Thump-thump
"If we do, we will die."
Thump-thump
"If you're scared, stay here.
Thump-thump
"...Fine.
Thump-thump, thump-thump, thump-thump
"Ian!"
Thump-thump
"Hey, put the gun down, okay? Put the gun down!"
Thump-thump
"IAN!"
Thump-th-
BANG.

When I woke up, there was no light. No sound. No nothing. Nothing but a ringing sound in my ears and an aching in my head. Slowly, my senses started to fade in around me. Sound started to echo around me.
"Mitchell Hughes is dead sir. Like you ordered."
"How'd you do it?"
"Threw him into the river. Seemed suitable."
"Very good... Take the day off, Major."
"Who's gonna watch the cells?"
"Do you honestly think somebody's gonna try to bust a Bacca out of prison?"
"...No sir."
"Take the day off. We don't need anyone guarding the cells..."
"Yes sir. Thank you sir!" There were footsteps fading away into the distance, and then there was quiet. My feeling came back next. I felt something cold and hard beneath me; it felt like rock. I let out a low moan and slowly pushed myself up. I could feel my heart beating normally in my chest.
Thump-thump... Thump-thump...
My arms shook weakly under my weight, and I only managed to roll myself onto my back before they gave out. I groaned. I opened my eyes, but I couldn't see anything. Either I was blind or they place I was in was very dark, and to be honest, both made me feel less than safe.
I tried to remember why I was in this place, the cell as the men outside had said... But I didn't....