*crack door sound*
https://freesound.org/people/Beetlemuse/sounds/529952/

*Closing door*
https://freesound.org/people/jimbo555/sounds/630481/

*Creepy music
https://freesound.org/people/Audio_Dread/sounds/528880/

The textures for iron ore and prismarine bricks were borrowed from a texture pack by Cactus Maps.