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 this flying contraption; 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 soon discover that you need a special key to access the terminal delivering the containers. You can get it by defeating the most ferocious monsters in the Hub – trust us, you’ll understand who we are talking about when you encounter these guys.

Don't be surprised if after defeating one boss, an even more dangerous opponent appears. Or, if, in case of defeat, the boss starts chasing you throughout the location - the survivors have avoided the Hub all this time for a reason!