THE VAULT WAS INTRODUCED BY VAULT-TECH IN F.O.1 BASICALLY THE VAULT WAS SUPPOSED TO PROTECT PEOPLE FROM RAD-POISONING BUT IT TERRIBLY FAILED AND MOST VAULTS WERE DESTROYED OTHERS GOT INFECTED WITH RAD- POISONING IN F.O.3 THE COURIER(YOU) IS FORCED TO LEAVE THE SAFETY OF VAULT 0NE ZERO ONE. IN F.O.N.V THE VAULTS CAN BE FOUND AND MOST ARE OVERRIDDEN WITH GHOULS AND OUR SUPER MUTANTS =. BUT THERE ARE SOME VAULTS THAT HELP U IN THE GAME LIKE VAULT 22 IT IS A HOTEL WERE U CAN LIVE AND STAY IN OR VAULT 34 WERE U FIND PROBABLY THE MOST BOSS AND I MEAN BOSS WEAPON IN DA GAME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! THE ALL-AMERICAN. THAT IS ALL FOR TODAY NOOB'S STAY TUNED FOR TOMORROW ON WEAPONS