The Catastrophic Cannon is the first obstacle in the Wipeout Zone of Season 7, replacing both the Scare Chair and the Slingshock from the previous season.
It works the exact same way as the Bobsled Blastoff and the Springshot. Contestants open a lid on a sled inside a giant cannon and lie down on their stomachs. Then the lid closes, and on the last second of the countdown, the sled speeds up the track, and when it reaches the end, it fires them out of the cannon 40 feet into the air before they crash down into the water below.
In the TBS revival, it was modified into the Speeding Silver Bullet.