Assemble
https://freesound.org/people/outroelison/sounds/150950/
https://freesound.org/people/Vic5555/sounds/494484/

Gateway
https://freesound.org/people/colorsCrimsonTears/sounds/563542/
https://freesound.org/people/Bachsambora/sounds/752034/
https://freesound.org/people/GammaGool/sounds/735062/