The third level could be interpreted as a metaphor for:

The third level in The Third Level can be interpreted as a metaphor for escapism and the human desire to find refuge from the stresses of modern life. Charley’s discovery of this mysterious third level, which seemingly leads to the peaceful past of 1894, represents a psychological escape—a way for him to mentally withdraw from the anxieties and pressures he faces in the present. The third level symbolizes a longing for a simpler, less complicated existence and reflects the common human impulse to seek comfort in nostalgia and idealized memories. Through this metaphor, the story highlights how people often create mental sanctuaries to cope with life’s challenges.

This question related to Chapter 1 English Vistas Class 12th NCERT.
From the Chapter 1. The Third Level.
Give answer according to your understanding.