How could the gold and the passengers both be saved in the final sequence of the 1969 movie, Italian Job? At the end of the Italian Job, the cast are left in this predicament;  the bus they are travelling on with a pile of gold has veered over the edge of a cliff and is balanced precariously with the gang members on one side and the gold on the exposed side.
Any attempt to leave the bus will condemn the gold to fall hundreds of feet down the Italian mountainside and, it is assumed, attract the police who are looking for it.
Video here:  https://www.youtube.com/watch?v=HZCaSyid4m0



The gang leader played by Michael Caine, optimistically declares in the last line, from the floor of the tipping bus: "Hang on lads - I've got an idea!"
How could the team save themselves and the gold using real life physics?
Edit:  It is obvious that the total tonnage of gold in the bus weighs more than the combined body weight of those in the back of the bus which renders the final scene implausible but for the sake of this question assume the masses are equal.
 A: It looks like the back of the bus is what's hanging over the cliff. The gas tank is most likely at the back of the bus. Run the motor to empty the tank.
A: If the people move their center of mass further back, perhaps by pressing against the back wall and/or hanging off the back of bus, the person who weighs the least could crawl over to the gold and pass it to the rest of the people until all of the mass of the gold is transferred and they can exit the bus with it.
It's essentially just playing with levers.

If you want to check out the math, look here.
A: If the leader is shown at the fulcrum point, then his mass doesn't matter. As a result, he can move to the front of the bus, and the lightest person in the gang can exit the bus and start carrying rocks into the bus. When one person's mass worth of rocks has been brought on board, the lightest person can then retrieve some gold. Storing the retrieved gold within the bus will allow more gold to be moved, and eventually several gang members can move to speed up the process.
