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Half-Life: Opposing Force Hints
C4 Satchels
C4 satchels are the most powerful explosive you carry. When selected and used, a C4 satchel slides along the floor and waits for you to detonate it via the remote control that pops up. If you want to add more C4 detpacks to the trigger, use the secondary attack to drop more satchels. When the handheld trigger is visible, the primary attack button will detonate all C4 satchels.
C4 satchels work well as standard weapons and as traps. They also float and detonate underwater, making them very useful for underwater combat. You can have 5 C4 satchels at any given time.
