Miyamoto Turkey provided project and construction management services for the maintenance and repair of the underwater Turkey-Russia natural gas pipeline damaged due to a land slide at the sea entrance point of the Ambarli pump station. A 300-ton capacity crane mounted on a floating barge was used to float the damaged pipeline for repair weldings over the sea. After the repair operation, a 53 km long, 30-inch in diameter double line of Marmara sea transition was tested by launching a slightly smaller diameter size plastic ball under high pressure between the Ambarli and Pendik pumping stations.