HyDelta 4, the latest edition of the Dutch research program, HyDelta, is making strides in advancing sustainable hydrogen infrastructure. The project, with a 15-month duration, is led by a consortium comprising Gasunie, Netbeheer Nederland, TKI New Gas, DNV, Kiwa, TNO, and the New Energy Coalition. The initiative signifies progress in the energy transition, highlighting the role of sustainable gases like hydrogen, especially in industrial applications. The aim is to utilize the existing gas transport system for hydrogen distribution, paving the way for future needs. With a focus on practical aspects like optimal distribution to industrial clusters and grid maintenance, the research also addresses challenges such as managing hydrogen emissions and ensuring grid safety. HyDelta 4 builds upon past experiences and global trends, showcasing a shift towards actual implementation of hydrogen grids. The outcomes of the project will be made publicly available, continuing the tradition of sharing knowledge and attracting international interest. Funded by TKI Energy, as part of the Dutch Ministry's efforts for climate action, HyDelta 4 exemplifies collaborative innovation for a sustainable future.