"Jenna emerged from a snarl of narrow tunnels into a long hallway."

In addition to original music and sound by Spencer Baum, this episode includes sounds released on a Creative Commons Commercial Attribution license from freesound.org as follows:

male_Thijs_loud_scream.aiff by Thannvannispen 

stomp01.wav by Jan Koehl 

ObjectFalling1.aif by icaroferre 

inception sound 3.wav by ThatJeffCarter 

Descending space echo.wav by Dragonphoenix 

warped growl drone.wav by thatjeffcarter 

solid steel hammering LOOP 130903_00.wav by Klankbeeld  

screaming_male_painIII.mp3 by GabriellaUPF 

inception-stab-l.wav by Manholo 

Dark Shepard Tone 2 by Brain Claim 

Retro_Alarm_01.wav by orginaljun.deviantart.com 

Also, this episode includes the use of the song Visum by Kai Engel on a paid licensing arrangement with the creator.