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" Underwater " referred to the area below the surface of the water, such as the lower space of oceans, lakes, rivers, and other water bodies. For example, the Mariana Trench was an extremely deep underwater area in the western Pacific Ocean with unique biological and geological phenomena. The underwater caves of the Yucatan Peninsula are underwater areas filled with clear water. There are different types of caves, some of which can be used for swimming and cave diving under professional guidance. " Underground " referred to the area below the surface. For example, in some archaeological or cultural relics survey work, it would involve immovable cultural relics underground, such as ancient tombs. Geologically, some areas might have special landforms such as karst caves underground.

In terms of film and television," Daming Women's Prison " had an underwater prison setting. The film told the thrilling story of the female assassin 17 and the female divine doctor Tang Fang escaping from the underwater prison. In addition, there was an underwater prison in Estonia, Murru, located in Rummu, 45 kilometers west of Tallinn. It was built in 1930 and was once full of murderers.

Jiangning had Lan Meng underwater photography, which cost 198 yuan to experience the underwater mermaid project. The water here was filtered at a constant temperature for 24 hours and changed regularly. Even if one did not know how to swim, they could participate. Professional underwater equipment would be provided. The instructor would explain underwater knowledge, precautions, and action guidance. They would also patiently guide them to relax and adapt to the underwater environment. The teaching started from the basic holding breath. At the same time, Lan Meng Underwater photography was looking for a mermaid diving coach. The salary range was 8000 - 13000 yuan per month. The requirements were to have a mermaid diving license and be able to swim. It was best to have a mermaid coach license. A swimming coach license and a safety officer license were also acceptable. They could be full-time or part-time. In addition, this place focused on personal art photography and wedding photography, creating a dreamlike visual feast with unique underwater photography techniques. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

An unmanned underwater vehicle was a device that no one was driving, and it relied on remote control or automatic control to navigate underwater. In terms of functional use, it was mainly used in the civilian field in the early days, such as replacing divers for shipwreck salvage, deep water exploration, underwater cable laying and other operations. With the development of technology, its value in the military field gradually became prominent. In the military aspect, it can be used for search and rescue, intelligence, surveillance, and reconnaissance missions. The US Navy's naval and marine units use unmanned submarines equipped with a large number of sensors to draw seabed maps to provide data for submarine and airship operations. It can also track enemy submarines and attack them. It can be used as bait to deceive enemy submarines, or it can be used for reconnaissance or anti-reconnaissance of surface and underwater targets. It can be used as an external sound sensor platform for submarines to expand the search and reconnaissance range or form an anti-submarine cordon. They could go deep into the enemy's mine area to draw a map of the mine area, guide their own ships to safely cross the mine area or provide support for the mine sweeping/hunting ships, and also lay mines. From a structural point of view, some unmanned underwater vehicles were similar to torpedoes. They might be modified from torpedoes that removed explosives or needed to be released from submarine torpedoes. However, more of them had unique structures for specific functions. They were generally composed of skeletons and floating bodies, propulsion systems, navigation control systems, detection systems, etc. Some were also equipped with mechanisms such as robots. In terms of scale and performance development, different countries had different development results. For example, China had the HSU001 large unmanned underwater vehicle that could perform a variety of missions. Poly Technology's UUA- 300 series of super large unmanned underwater vehicles had advanced performance. Among them, the UUA-300CP had high combat capability, could carry a variety of weapons according to the mission, and had advanced information processing systems and communication systems. In the development of various countries, unmanned underwater vehicles showed a trend of increasing volume, strengthening core technical parameters, and more advanced comprehensive tactical means. According to the field of application, it could be divided into military and civilian. The novel "Flood Dragon" is equally exciting. Everyone is welcome to click and read it!