The sound comes from Half-Life 2, the first-person shooter released by Valve in 2004 and built on the Source engine. Its doors in City 17, laboratories and Combine facilities use short mechanical effects like this one to sell weight and technology without animation alone. The clip later spread through Garry's Mod, Source Filmmaker and machinima, where creators reuse the same audio for custom maps and videos. That reuse keeps the door instantly recognizable to PC gaming fans nearly two decades later.
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The HL2 door sound effect from Half-Life 2 is a short mechanical sliding door noise used in games, videos and memes for sci-fi entrances and exits.
This is the third door sound from Half-Life 2, a 1.7 second clip of a heavy futuristic door unlocking and sliding open with a metallic scrape and hydraulic hiss. The sound is dry and mechanical, with a short clunk at the start and a smooth powered glide that ends cleanly. In a video it instantly signals a lab, spaceship or secure facility opening, and the familiar Source engine tone makes the moment feel tense, sterile and high-tech even without any visuals to explain the setting.