The video is in the public to elaborate about can not tell a real fish and to tell "fish robot" is swim the sea

In the survey method of marine organisms, there are methods such as surveying creatures trapped by the ocean in the net, and investigating divers and exploration boats in the ocean. However, there is a limit in methods such as capturing and exploration boats in order to know how living in nature is not wary of marine organisms. The research team of Massachusetts Institute of Technology is an elaborate fish robot not wary of other organisms for the purpose of marine biological exploration "SoFi"Was produced.

Soft robotic fish swims alongside real ones in coral reefs | MIT News
http://news.mit.edu/2018/soft-robotic-fish-swims-alongside-real-ones-coral-reefs-0321

A movie whose "SoFi" is actually swimming underwater is also released on YouTube.

A Robotic Fish Swims in the Ocean


It was the offshore of Fiji that tested. SoFi is swimming about 50 feet (about 15 meters) deep into the ocean floor.


SoFi can be swimmed in the sea autonomously completely without having to connect with a wire etc. or operate with a remote control. Looking closely, there are notches on the side or not the fish's face, but the figure swimming is the fish itself.


The state of SoFi which goes slowly and underwater gives a somewhat humorous impression.


Without hitting obstacles in the immediate area, SoFi swims while swaying the tail with a smoothness that is unlikely to be a robot.


SoFi is made of very lightweight material and is floating with buoyancy of SoFi itself, so we do not need much power to keep it from sinking in the water.


I am going to swim around the SoFi that swims slowly under the coral, as if the tropical fish do not care.


SoFi is equipped with a camera, it is possible to record the surroundings while swimming. Currently only ordinary cameras are loaded, but we are also considering installing a camera that automatically tracks fish movements.


Researchers do not have to worry about dangerous obstacles around SoFi at all times because SoFi covered with silicone rubber and soft plastic is less likely to break even if it hits the surrounding rocks and fish . SoFi can be broken down finely.


There is a small motor around Ella and an electronic control board on the head.


It is a small hydraulic pump that moves the tail fin.


The body made of urethane realizes a smooth movement, it has a structure of fine nodes continuing, it also said that it will demonstrate the effect of increasing buoyancy.


It can move like a real fish with a silicone jacket.


Depending on the controller, it is also possible for the diver to change the swim depth and swimming pattern of SoFi. It is unknown what the reason is, but the controller imitated Super Nintendo's controlleriBUFFALO made game padusing.


It seems a bit strange that the actual operation of SoFi using the controller in the water. We are using ultrasonic waves of 30 to 36 kilohertz for communication.


When swimming normally, SoFi freely removes obstacles without permission.


Sending a command to raise SoFi, the body turns upward ......


I will rise in the sea toward the surface of the water.


It is said that SoFi is equipped with a mechanism to control the buoyancy inside, and it has the advantage that it can swim not only at a constant depth but also at various depths.


SoFi can easily swim to the vicinity of the boat that is waiting on the ocean by himself, even if it is not connected to the boat with a wire, so it can be collected easily.