What if Saturn's moon Mimas orbited our Moon as a submoon? Mimas circles the Moon at roughly 7,500 km — well inside the lunar Hill sphere of about 60,000 km — while the Earth–Moon pair continues its familiar path around the Sun. Submoons are theoretically possible but thought to be short-lived: tidal forces from Earth and the Sun quickly destabilise small satellites of moons. Mimas, only 396 km across, would raise additional tides on the Moon and create a spectacular double-satellite system visible from Earth. Real submoon searches around Jupiter's and Saturn's moons have so far found none, suggesting that nature rarely permits this nested orbital architecture to persist.