The way to get a drone and get into the Hub is described in detail in this article.

So, you're a happy drone owner now, but you still can't find any new resources? In the Hub, you need to search and scan special containers with cargo using the drone; this is how you can get the most valuable items. But finding and scanning the cargo is only half the trouble. In one of the rooms in the new location, you’ll discover that you need a special key to access the terminal delivering the containers. You can get it by defeating the most ferocious bosses in the Hub—trust us, you’ll understand who we are talking about when you encounter those guys.

Don't be surprised if after defeating one boss, you stumble upon an even deadlier enemy. Or, if, in case of defeat, the boss starts chasing you all over the location. The Transport Hub, as well as the Laboratory, are intended for the most experienced survivors who’ve been through hell, high water, and water pumps in the Settlement. Does that sound like you? Let's see :)