I cut open the protective plastic sheathing on the bomb components. Deftly manipulating them, I assemble the remotely-detonated explosive device. My ZOOT-suit is wired to transmit its location data to my HUD so that I can see what I am doing. The device on which I am currently working will be detonated by a radio transmission in the ELF frequency range after we leave the ship.

The room is proofed from most radio waves. They assume that no one will be able to use anything below SLF frequencies in space. They forget that when they’re in orbit around a friendly planet, physics swings into our direction.

ELF waves, a range down from SLF, run from about three to thirty Hertz. In order to transmit radio waves, antennae must be of a certain fraction of the size of the wave transmitted, at least in one dimension. When broadcasting in the ELF range, one needs a ludicrously large antenna.

Like a planet.

By driving shafts deep into the ground, we managed to turn the planet below into a giant radio wave transmitter.