M20: Insurrection is the 20th mission in Metroid Prime: Federation Force, and the final mission on Bion. Following the M19: Incursion, it was believed that the Space Pirates had more than one transfer device active. This is confirmed when more of the encrypted Pirate messages retrieved by Samus Aran are decrypted. The second machine is located on Bion, and the Federation Force is sent to destroy it.