For what purpose is a tunnel being built under the Bosporus?

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Explanation:

Alternately described as a long-lost link between Europe and Asia or the end of the city of Istanbul as we know it, the world's deepest underwater railway tunnel Us on Tuesday under The Bosphorus, connecting two continents by rail for the first time.

developed and developing countriescountries are divided into two major categories by the united nations, which are developed countries and developing countries. the classification of countries is based on the economic status such as gdp, gnp, per capita income, industrialization, the standard of living, etc. developed countries refers to the soverign state, whose economy has highly progressed and possesses great technological infrastructure, as compared to other nations.