Road tunnel under the Bosporus

Earth dug in the project enough to fill 788 Olympic pools, while the iron used could build 10 Eiffel Towers

Turkish President Recep Tayyip Erdogan was scheduled to open the first road tunnel underneath the Bosporus Strait in Istanbul on Tuesday, the latest project completed in his plan of transforming the country's infrastructure.

Turkey in October 2013 opened the Marmaray rail tunnel underneath the iconic waterway, the first link beneath the waters that divide Europe and Asia.