Satchel charge

Summary
The Marines use satchel charges to clear large, reinforced doors or obstacles out of the way, though they are also often used as weapons themselves to dislodge dug-in enemy troops. One such charge can be found next to the dead marine with the rocket-launcher. This marine can be found just after the first open arena after you leave the tunnels of Metropolis. Sadly, the satchel charge cannot be used by the player.

These charges are also capable of blowing through three-meter thick battleplate.