Blackout

Blackout is an overseer quest and the first part of the Party at the End of the World multistage questline in Fallout Shelter.

Walkthrough
A fellow vault dweller, more specifically the overseer's son, named Jack, has got himself lost after an intense night of partying with raiders.

This quest takes place in a four level blue Corvega auto plant building with a random layout. Enemies may include mole rats in groups of one to two, radroaches in groups of three to five, and most of all, radscorpions in pairs. At some point, there will be a glowing radscorpion accompanied by another radscorpion. Once it is defeated, the room it is in contains two Nuka-Cola Quantum, a rare outfit, and a piece of legendary junk. Near the top of the building is a raider who will give the player's dwellers a quest clue regarding Jack's whereabouts.