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Delphus as a sonar goggles (Doppler's law) to detect distant seawater flow rate and direction, uses sound waves to impact the speed of sound changes to objects, and then measured the seawater flow direction and speed, shallow sea often responsenot know under the sea change is likely to cause casualties. using water battery, Delphus addition to sonar detection 'before the front of the flow rate can also be used outside the waters when the knows teammates orientation tool, greatly reduce diving dangerous.
JIA WEI HU