Due to tunnel construction at the southern entrance of Bosphorus, since the beginning of August 2005, only one way traffic is permitted at Bsophorus Strait and it is strongly recommended by VTS authority to take pilot for Bosphorus transit and to pay extra attention during the passage of Bosphorus and strictly follow the instructions of VTS Centers and pilots (If pilot is on board) Tunnel construction will be on the bottom of the sea at the southern entrance of Bosphorus. The tunnel is built for railway + subway constructions. Due to dredging work, the traffic thru Bosphorus re-organized by VTS Center as one way and subject traffic arrangements causing delays thru Turkish Straits. Therefore we recommend all the vessels to fulfill the instructions of VTS Centre.