Since Metropolis is a silent film, "subtitles" usually refer to the (the text cards between scenes). Key Dialogue related to "Deep" : "Deep beneath the earth lay the city of the workers".
DVDBeaver : Offers a comparison of different restorations (1927, 1984, 2010), which have slightly different subtitle translations.
Freder's realization: "It means: Go below!... Into the depths!". Where to Find Full Subtitles Metropolis subtitles English
If you are looking for the full text files to watch the film, you can find them on major subtitle repositories:
: These "papers" reveal the growing unrest and organization among the working class, leading Fredersen to hire the "Thin Man" to spy on his son, Freder. English Subtitles & Intertitles Since Metropolis is a silent film, "subtitles" usually
: The foreman, Grot, brings the papers to the Master of Metropolis, Joh Fredersen, after an accident at the M-Machine.
In the 1927 silent film Metropolis , the "deep paper" likely refers to the found in the pockets of workers, containing mysterious hand-drawn diagrams or maps of the underground catacombs. Context of the Scene Freder's realization: "It means: Go below
Wikipedia's TimedText for Metropolis : Provides a line-by-line breakdown of the English intertitles.