- Catching the Moon - Currently the Space Elevator just goes straight up... but what if it was tethered at one end to one of Mars' moons? And what if you could then build a new colony right up there at the other end, making it a true starport for Mars?
Now a tether only attached to Deimos and free floating but sufficiently weighted at the Mars end not to escape into space: The Mars end would still move across the terrain at about 164 km/h if my calculations are correct. On the positive side Deimos has an extremely circular orbit so the highest and lowest point of the weight rushing through Martian atmosphere would only differ by 15 km.