Intro music taken from:
Unify by Snowflake
http://ccmixter.org/files/snowflake/59709
Used under the CC Attribution license
https://creativecommons.org/licenses/by/3.0/

Episode 29 – The Donner Party
blackSnow by airtone (c) copyright 2021 Licensed under a Creative Commons Attribution (3.0) license. http://dig.ccmixter.org/files/airtone/63513

Episode 17 – The Disappearance of Elisa Lam
This episode is licensed under the Creative Commons Attribution-Share Alike 4.0 International license.

Poldoro by Milton Arias:
https://freemusicarchive.org/music/Milton_Arias/64Antes_del_Fin/Poldoro

Episode 4.4 – Siege of Kaffa
This episode is licensed under the Creative Commons Attribution-Share Alike 4.0 International license.

Demonstrations of Tuvan singing by Giovanni Bortoluzzi:

Wood Creaking by dheming:
https://freesound.org/people/dheming/sounds/177778/

Ancient, old time battle, combat, horses snorting and galloping, men shouting and barking, fencing, swords clanging, mix by YleArkisto:
https://freesound.org/people/YleArkisto/sounds/258207/

Episode 4.3 – Dancing Plague
Excerpts from:

Episode 4.2 – Cherry Blossoms

the universe sings ft. jonatha chance by kthugha (c) copyright 2020 Licensed under a Creative Commons Attribution (3.0) license. Ft: jonatha chance

spitfire:
https://freesound.org/people/mattew/sounds/42968/

Episode 4.1 – Carancas

steam:
https://freesound.org/people/sniperous/sounds/365071/

bubbling:
https://freesound.org/people/InspectorJ/sounds/398808/
by InspectorJ (www.jshaw.co.uk) of Freesound.org, used under CC Attribution license

meteorite:
https://freesound.org/people/jongrubbs/sounds/178182/

spooky song:
https://freesound.org/people/Duckers_Duckerson/sounds/366787/

flute:
https://freesound.org/people/CarlosCarty/sounds/415810/
by CarlosCarty (https://www.fiverr.com/carloscarty), used under CC Attribution license

lamas band:
https://freesound.org/people/anne82/sounds/276065/

Episode 3 – The Lost Franklin Expedition
shipbell sound:
https://freesound.org/people/vumseplutten1709/sounds/200289/
Used under CC0 license

ship sounds by LXX.70:
https://freesound.org/people/LXX.70/sounds/91071/
Used under CC Attribution license

Lady Franklin’s Lament excerpt:
https://www.youtube.com/watch?v=sZE7LSx3Pvg