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EI-11 appeared in episode 10 of GaoGaiGar and was a submarine type robot. Its host was a disgruntled captain who was not picked to accompany a top-edge submarine in its maiden voyage. Once seizing control of the vessel, its purpose was to go to the Marianas Trench, the lowest point in the sea.
Pinchernone, who created it, noted he made it mostly from a lucky occasion, but that at the depth it was diving, there would be no human to destroy it. This proved to be wrong.