Good point. I think you would have to choose the number of depots carefully though. If you only have a single very famous depot then you can perhaps count on

Good point. I think you would have to choose the number of depots carefully though. If you only have a single very famous depot then you can perhaps count on it being remembered in legend, particularly if it is somewhere very unique (the south pole perhaps). More depots increase redundancy but could perhaps reduce the "interesting" factor. After a certain point though you could probably have enough depots that, since they are all over the place and constantly being discovered, they would stay in the minds of humanity.