The Polaris[1] was a Zion hovercraft.
It was crewed by collectors, one of which was Nova, and regularly went to the surface in order to collect artifacts of human history. It was, at one point, joined by the pioneer of collecting, Flint, the very first known collector from Zion. Flint joined after losing his own ship and crew, the Pequod, in similar collection missions conducted in the surface.