Submarines have been one of the most feared weapons in naval warfare since their inception.

Not because of how powerful its firepower is, but because its trajectory of activity has been hidden under the sea, coming and going without a trace, making it impossible to guard against.

To ensure sea power, the development of search technology for submarines is an essential key.

Whether it is the United States, the fur bears in the north, or China, a lot of money has been invested in the research of this technology.

"The Plug-in Player in Marvel" EP1006. Turning, going to the inland is in hand, please wait a moment,

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