Camp 4 was a mining cmap on the planet Sisuphos. For a while it was under the control of Hans Gruber, who had left control of Camp 3 to his older brother, Joseph, to make his own fortune. Hans himself was killed in an Open Cast Mining Tractor duel with Joseph, due to the discovery of a prime lode between the two camps. The destruction of both OCMTs (Joseph stole Camp 4's orange OCMT, while Hans stole Camp 3's blue one) destroyed the lode.