The massive Gauna pod 542 remains on a collision course with the Sidonia. It is discovered that the Gauna placenta has manifested around an asteroid and is planning to ram and destroy Sidonia. Yuhata tries to maneuver Sidonia out of the way using thrust level 2, but all efforts to avoid a collision end in failure as the Gauna also corrects its course accordingly to maintain a collision path. The Captain orders that guardian frames be outfitted with the new experimental placenta piercing weaponry. 48 frames are deployed, and an anti-planetary missile is launched at the Gauna. Yuhata explains the plan to the pilots, stating that the 48 guardians will separate into 2 platoons. Platoon 2 is to destroy the Gauna's tail, its means of propulsion, and platoon 1 is to destroy as much placenta as possible, allowing the anti-planetary missile to reach the asteroid at the heart of the Gauna. Nagate and Izana are both deployed with platoon 1, arriving 2 hours ahead of the anti-planetary missile. The plan initially goes smoothly with both platoons making short work of the Gauna's placenta. Suddenly the placenta beneath platoon 1 morphs into Heigus cannons, and begins barraging platoon 1 with Heigus cannon fire. Platoon 2 nearly destroys 90% of the propulsion system, but Benisuzume (Crimson Hawk Moth) appears and rapidly destroys all 24 Guardians in platoon 2. With platoon 2 annihilated, only 14 Guardians remaining in platoon 1, and one hour remaining, Yuhata quickly formulates a new plan: to activate Sidonia's super Heigus particle cannon and fire it at the head of the Gauna pod. This would then allow the remaining pilots of platoon 1 to fly into the Gauna structure to locate and destroy the 'Master Gauna', which supposedly controls the massive pod. However, firing Sidonia's cannon will require rerouting its entire power supply and will temporarily consume all its Heigus particles, leaving Sidonia without propulsion to maneuver away from a collision course if the plan fails. With no other option, the Captain approves the plan and the Sidonia fires the Heigus cannon at the Gauna pod.