system
Given the following post, respond as if you're commenting on Reddit:
human
[Treasure Planet]How did Captain Flint make world spanning portal creator?

How did he keep it from his crew? Why didn't Silver and the rest of the crew know about it?
gpt
He didn't. Treasure Planet itself was in fact an ancient space station created by a precursor race millions of years ago who were capable of opening portals. The map was a control device for it-- a sort of navigational device used by this race that described their coordinates relative to the nearest portal planet.