Step 1: The Mumbai Coastal Road Project is one of the biggest infrastructure projects in Maharashtra, designed to reduce traffic congestion.
Step 2: The project involves advanced coastal engineering, especially reclamation, dykes, and storm surge protection.
Step 3: The Netherlands, known for its world-class expertise in water management and coastal engineering, has been providing technological support for the project. \[ \boxed{\text{Netherlands}} \]
The DDR&D deals with research and development of defence technologies, systems, and equipment. DDR&D stands for: