The connection of nodes in the submarine observatory network is a crucial part of constructing such a network. During construction, optical cables are laid on the seabed, and multiple seabed nodes are set up along them. These nodes are connected by underwater wet-mate connectors to achieve long-term and stable fiber-optic and cable connections. The underwater wet-mate connectors are made of special materials and have a unique structure, allowing for plugging and unplugging operations in deep-sea environments. They can effectively prevent water and pollutants from entering the interior of the connectors, ensuring the normal operation of the connectors and enabling the transmission of signals and electricity. With the connection of nodes, the submarine observatory network can conduct long-term, real-time, high-precision, three-dimensional and continuous observations of data such as hydrometeorology, ecological environment, and marine geological disasters in vast sea areas. It plays an irreplaceable and important role in many aspects, including marine and earth science research, marine environmental protection, marine economic development, and marine disaster warn