Astronaut in the Ocean by Australian rapper Masked Wolf was released in 2019 and became a huge TikTok hit in early 2021, when creators began using its opening line for reveal, transformation and confidence videos. The phrase rollin down in the deep became instantly quotable, helped by the song's dark beat and memorable delivery, and it spread beyond TikTok into reels, edits and meme compilations. It is still used because the line works as a short, self-contained setup that signals something impressive is coming without needing any extra context.