Send units with the "Recycling" ability to a Comet or high orbit where there is or is expected to be debris after battle. Debris will be collected, recycled and delivered as metal and minerals, and from the comet gas will be collected. Recycling takes time, the more units you send, the faster they can collect all resources. If enemy battle fleet arrives on the coordinates where your recyclers without aggression option turned on , they will return automatically. If you sent the fleet to collect debris with aggression option turned on, then in the case of the arrival of the enemy fleet, a battle will occur and the debris will be collected by the winner or by all the fighters if the battle ends in a draw. Allies can recycle debris on the same coordinates simultaneously. In case of destruction of units with collected debris, 50% of metal and minerals from the holds fall back to the coordinates, and all collected gas dissipates.