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Jessialex is correct, the trick is to get the fire and ice bombs together to blow up first the metal box, then the mesh off the line blaster. It isn't easy getting them together, especially without blowing up the 2nd bomb with the 1st. If you have extra block busters they can be very handy!Here is a video example:https://www.youtube.com/watch?v=dnHRDHi0eKs