The Crater is the new starting point of the multiplayer in the game, since Beta v.1.16.3, the Camp. Sector 7 was removed. To access the Crater, you need to go to Abandoned convoy, only available to players level 150 or above, but was reduced to level 15 since Season 9, but was raised to level 60 afterwards and changed back to level 30.
Accessible since Beta v.1.17.1, is used to travel to other Clans locations, its great opportunity to buy items you need to upgrade your business level.
The first 9 blueprints are unlocked, the others 30 are locked, from 10 up to 39, you need increase your Business level to get these blueprints.