The Tank is an obstacle in Double Dare.
This obstacle consists of a tank, filled with a certain substance. When contestants reach this obstacle, they have to jump in, pass the flag onto their partner, and move on to the next obstacle.
For the 2018 revival's Halloween special, Double Scare, it was renamed 'Witches Brew'.
The obstacle will be returning for season 2 of the 2018 revival.
In the 2018 revival, there are multiple variations of The Tank with different substances in it like ping pong balls or cherry gelatin.