In the article "Doris Lessing Wins Nobel Prize in Literature," we learn a little about Lessing's childhood and youth. We learn that she was born in Persia, but moved to Zimbabwe when still very young. We also learn that she moved to Salisbury when she was 15, and that she took jobs as a telephone operator and nursemaid. She married at 19 and had two children, and then left her family. Moreover, we learn that she described her childhood as "sad."
All of this information allows us to better understand the context of "Through the Tunnel." In this story, the characters are British people in an unfamiliar, foreign environment. This resembles Lessing's early life and that of her family. Moreover, the main character of the story, Jerry, undergoes an important transformation in his life as the tunnel becomes a rite of passage for him. We learn that Lessing was also a teenager when she went through many of the transformative experiences of her life. This shows that Lessing understands the importance of rites of passage to reaching maturity and adulthood.