Pale and plump with a tail that swishes side-to-side, the one-eyed robotic fish was built by scientists at MIT's Computer Science and Artificial Intelligence Laboratory (CSAIL).
It is designed to swim naturally alongside other fish in open water and spy on them without raising suspicions or disturbing their natural habitat.
The un-tethered robot can use its camera to record behaviors of anything from sharks and whales to schools of tiny damselfish.
"With an instrument that does not impact the marine life, that is not scary or foreign to marine life, who knows what kind of magical and miraculous moments we can capture?" said Daniela Rus, director of CSAIL, who worked on the project. "[It] will give us a better understanding of underwater phenomena."
The group, which includes Rus, Robert Katzschmann, Joseph DelPreto and Robert MacCurdy, introduced SoFi to the public on Wednesday in a new paper.
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