The underwater searching is difficult because of the harsh and dangerous environment. Sometimes secondary injuries may occur on divers. Underwater vehicles have the advantages of real-time responsibility and strong expansibility, which could work in a deeper depth and large area. Many countries and organizations have involved underwater vehicles for rescue and salvage work, especially for deep-water salvage operations. Deepinfar. Ltd provides a full line of underwater vehicles, some of which could be equipped with sonar, multi-functional manipulator, etc., providing a fast, efficient and related-safe solution for rescue and salvage in sea, river, lake and other water environment.