Underwater target detection is a pivotal technology in marine observation. Traditional detection methods primarily rely on acoustic and optical techniques. However, their accuracy is constrained in turbid waters and complex environments. Inspired by weakly electric fish, we present a spatially sensitive detection system based on active electrosense, capable of autonomously generating electric fields to identify underwater targets. This system incorporates the concept of multi-measurement vectors (MMVs) from compressed sensing and the direction of arrival estimation problem, adapting it to our specific application by utilizing spatial geometric information for multi-electrode signal detection. This approach effectively enhances detection sensitivity in both short distance and turbid water environments. Experiments in a saltwater pool demonstrated the system’s excellent current sensitivity to metallic targets, such as submarine cables, particularly at short distances. This capability addresses inherent challenges in traditional optical and acoustic methods, highlighting the practicality and effectiveness of the proposed system.

The fall pipe rock dumping technique is extensively employed to create protection embankments around submarine cables, mitigating distortion and breakage resulting from bottom scouring. During the rock dumping operation, intricate interactions among the pipeline, rocks, and water currents can affect the stability and efficiency of the fall pipe system. This research proposed a method employing the fluid–structure interaction to analyze the interactions between the pipeline, rocks, and water currents. The paper begins with the design of an innovative fall pipe rock dumping system and presents a theoretical analysis of the applied model testing approach. The simulation parameters were determined according to the geometric, Froude, and Strouhal similarity criteria. A thorough numerical analysis was performed to investigate the hydrodynamic properties of the rockfall pipeline under fluid–structure interaction. The research examined the settling of rocks during rockfall, along with the forces and movements associated with the deposition process. The results show that the rockfall pipeline experienced vortex-induced vibrations (VIVs) caused by ocean currents during operation. The maximum settling velocity of the rocks throughout the rockfall process reached 2.2 m/s, with a final stable velocity of 1.5 m/s. These simulation results offer critical insights for improving the design and functionality of the rockfall pipeline, thereby enhancing the protection of underwater infrastructure.