When playing “Battles with Big Teams” mode, sooner or later you will come across a huge, blocked door. This is indicated by red lines on the plates, which makes it impossible to open them when you approach them with your character. To open it, look for the panel near the panel – interact with it and wait for your artificial intelligence to hack the network and open the door.
Right behind them, there will be large rooms with racks for weapons or gadgets. However, this is not ordinary equipment, but the usually legendary item (s) that you will not find during regular exploration of a map designed for squads filled with 12 players.
These types of buildings are not marked on the map, so you have to find them yourself. However, once you familiarize yourself with the vast arenas (there are three of them in total), you will more or less know which way you should go to reach the blocked doors with great items behind them. Remember, however, that when you die, you will lose them.