On 21 March 2015 a catwalk broke away from its bolted joint cable on the south tower during the construction at the bridge and fell into the water.
Added in February 2015, the catwalk was needed to allow workers access to the other side of the bay.
No one was harmed by the accident as work was interrupted at this section due to windy weather.
Marine traffic to and from İzmit Bay was suspended following the accident for security reasons and resumed after recovering the cable in the morning of 23 March.

Kishi Ryoichi, the 51-year-old Japanese engineer of the IHI-Itochu Consortium, who was in charge of the construction at site, committed suicide after the accident.
He was found dead at the entrance of a cemetery near his lodging in Altınova.
He left a note saying that "...this failure ends my private and professional life.
This project was mine and my country's pride.
No one else is responsible for this failure."
On 21 March 2015 a catwalk broke away from its bolted joint cable on the south tower during the construction at the bridge and fell into the water. Added in February 2015, the catwalk was needed to allow workers access to the other side of the bay. No one was harmed by the accident as work was interrupted at this section due to windy weather. Marine traffic to and from İzmit Bay was suspended following the accident for security reasons and resumed after recovering the cable in the morning of 23 March.
Kishi Ryoichi, the 51-year-old Japanese engineer of the IHI-Itochu Consortium, who was in charge of the construction at site, committed suicide after the accident. He was found dead at the entrance of a cemetery near his lodging in Altınova. He left a note saying that "...this failure ends my private and professional life. This project was mine and my country's pride. No one else is responsible for this failure."
Osman Gazi Bridge