Subnautica is a survival game developed by Unknown Worlds Entertainment, first released in early access in 2014 and fully launched in 2018. Its onboard PDA delivers navigation and survival alerts in a detached computer voice, including warnings tied to vehicle depth and hull integrity. Clips of those alerts spread through gameplay videos, streams, and soundboards because the line works outside the game as a generic danger alarm sound effect for any risky descent. Players still use it to signal that a build, dive, or decision has gone too far.