Isaac Peral y Caballero was a Spanish sailor, inventor, and engineer born in 1851 who is renowned for designing the first electric submarine in 1884. He studied in San Fernando and had a military career that involved extensive travel around the world. After retiring from the army, he started a company in Madrid to commercialize his inventions, which were based heavily on his expertise in electricity and involved areas like geography, math, and physics. However, his fame faded in the late 1880s despite building a 22 meter long, 2.87 meter wide electric submarine prototype in 1888 that demonstrated his pioneering work designing one of the first viable submarines.