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It sounds like you have encountered an unknown machine. It is important to be cautious when interacting with unfamiliar equipment, as it may not be safe to use.

Download:

Steam Workshop: https://steamcommunity.com/sharedfiles/filedetails/?id=2827187413

ModDB: https://www.moddb.com/games/portal-2/addons/gelsquared

Direct Download: https://drive.proton.me/urls/MT9BP8BK08#2ejKCP7yH8rc