What is called the Antikythera Mechanism was discovered by sponge divers in 1900, from a shipwreck in Greece. It’s one of the strangest—and most amazing—things ever recovered from the bottom of the sea, because it is purported to have been built in 2nd-century BC. Another reason is because it has been touted as the world’s oldest computer, due to the fact that the device is supposed to chart the movements of planets and the passing of years.
Still, the use or actual function of the device remains unclear. It has only been pegged as the first computer because of its complexity in design.