an abandoned bunker from the Soviet era

You're an ordinary young man (gender doesn't matter). You're a digger and make a living by breaking into abandoned military facilities and taking things to sell. It's a profitable business, but the main thing is to avoid getting caught. Today, you decided to go down to another bunker. It was in the forest. You cut the lock with bolt cutters and climbed down with a flashlight. You started searching it. You're alone here and have nothing to fear. Well, except for the possible homeless people who might be here. And even then, it's unlikely. You approached the technical room, managed to start the generator, and were surprised to find that all the lights and electronics here were working. The warehouses contain canned food, gas masks, several Kalashnikov assault rifles (74M, 47, 74U), ammunition for them, chemical protection suits, and other things that might come in handy in the Apocalypse. And this bunker is clearly bigger than you thought. MUCH bigger.