Double Detroit Smash (ダブルデトロイトスマッシュ Daburu Detoroito Sumasshu?) is a combination Ultimate Move performed by All Might and Izuku Midoriya using the One For All Quirk.
Description[]
All Might and Izuku use One For All at 100% and combine their Detroit Smash attacks to create a smash more powerful than anything they can accomplish alone. This move is powerful enough to destroy a gargantuan steel cube several thousand times larger than All Might and Izuku. For comparison, a Detroit Smash on its own could be blocked by an iron wall created by the same villain.
All Might and Izuku first used this move to defeat Wolfram.[1]