For those who don't like cheating very much, here is a trick for remote charges. plant the remote charge, and press the use key to pick it up again. Now you've picked up 2 remote charges. keep doing that and you'll be at 21. you can get anywhere in the game with explosives. for example, in the canyon where you'll find the first mercenarys, you can see a cable above you somewhere. blow some holes in the rock and you'll have 'stairs' as I call it.you can climb further to the top and there is the cable car.have fun blowing up!