This paper reviewed the development, installation, and operation of these infrastructures, including their structures, design, installation, marine environment loads, and applications. The research gaps and further research directions are explored through this literature review. First, different floating structures were briefly analyzed and reviewed. Second, the subsea production structures, including subsea manifolds and their foundations, were reviewed and discussed. Third, the basic characteristics and design methods of deep-sea pipelines, including subsea pipelines and risers, were analyzed and reviewed. Finally, the installation and bearing capacity of deep-sea subsea anchors and seabed trench influence on the anchor capacity were reviewed.

The current status, hotspots, and frontiers of research on the interaction between internal solitary waves (ISWs) and the seafloor were analyzed by Citespace. It provides a new perspective for an in-depth understanding of the interaction between ISWs and the seafloor. The latest research results of the bottom boundary layer are introduced, and the unresolved problems in the current research work are summarized. This work provides a reference for further research on the hazards of ISWs to marine engineering geology.

India has a huge resource of offshore limemud (carbonate mineral). Studies found the suitability of the offshore limemud for various industrial applications in cement, filler, blast furnace, steel melting shop, lime production, paint, and Grade-I steel industries.

To analyze the evolution law of physical and mechanical properties of a reservoir during hydrate production, a numerical simulation of long-term gas hydrate production by the depressurization method via a horizontal well was carried out based on the drilling data of the GMGS3-W19 site, the mechanical experimental data in the laboratory, and the Multiphysics-Coupling model. The characteristics of gas production, and the spatio-temporal evolution law of settlement and stress distribution of reservoirs with different slope angles during hydrate production by depressurization in 5 years were obtained and analyzed. It is concluded that the low permeability of reservoirs in the South China Sea limits the propagation range of pore-pressure drop and reduces the gas production rate and amount, and continuous hydrate dissociation will cause nonhomogeneous severe settlement of the hydrate reservoirs.

This article establishes a three-dimensional numerical model of currents and waves–submarine pipeline–silty sandy seabed, explores the local scour development and characteristics of submarine pipelines in the Yellow River Delta silty sandy seabed in the prototype environment, and analyzes the influence of the presence of pipelines on hydrodynamic features such as the surrounding flow field, shear stress, and turbulence intensity.

In this study, the physical and mechanical properties of silt and sand from the Yellow Sea are measured and microscopically explored.