This effect is definitely a show piece.  The bridge buster is a 10 foot long (including ramps) bridge with a screen built into the floor.  The "shaft" scene on the screen appears to go down forever.  When triggered, a character comes climbing up the pipes and begins banging on the floor of the bridge causing the entire prop to bounce with each hit.  Finally, he reaches off screen and breaks a steam pipe there blasting guests with "steam".  This effect is great in any boiler room or basement type scene and goes great with the Pipe Smasher listed above.

Price includes pre-programmed control hardware, solid state video player, monitor, flow control valves, digital sound module, fog system, 6in. by 23in. mat switch trigger, and all necessary electrical and pneumatic connections.  Prop connects to air lines with a 1/4in. male quick connect coupling.  Requires 100psi compressed air and 110VAC electrical.