BİMTAŞ

Described as Europe's largest wooden building, the Prinkipo Greek Orphanage in Büyükada, the largest of Istanbul's nine Princes' Islands, will be saved from a possible collapse with a planned but expensive restoration work.

The historic structure will require some 20 million euros for restoration, according to experts, who completed surveying the building following long delays.

An underwater pedestrian tunnel connecting Istanbul's European and Asian sides will go out to tender on March 27. 

The two-kilometers tunnel, with a diameter between 12 and 15 meters, will connect the Kabataş district on the European side to Üsküdar district on the Asian side and will include moving walkways as well as bicycle and electric vehicle lanes. 

Drilling work for an underwater pedestrian tunnel that will connect Istanbul's European and Asian sides has begun.