When going for the Jackal after you have completed the mission with the blue 
square on it, you must go to a shack where he is hiding. When you get into the 
shack, he will give you two choices. You can either take the diamonds or the car 
battery. If you take the diamonds, he tells you to take them and bribe the 
commander or take the car battery and fix the explosives. However, if you take 
the diamonds, be careful with the large hole in the middle. If you drop in, you 
will not be able to get out.