This sound comes from Subnautica, the underwater survival game by Unknown Worlds Entertainment, where the Cyclops submarine uses a distinctive onboard voice. The "All systems online" line became memorable among players because it plays during startup and immediately signals safety, power, and exploration. Outside the game, it spread through gaming clips, YouTube edits, and short meme videos as a quick way to frame a dramatic activation moment. It remains popular because even nonplayers understand the futuristic system-boot meaning from the delivery alone.