Preparations were also made to recover aircraft or crews if any of the bombers ran short of fuel or suffered battle damage. RAF Sumburgh in Shetland was selected as the emergency airfield for the return journey from Tromsø. If any of the bombers experienced engine problems or lacked sufficient fuel to return to the UK, they were to proceed to the Soviet airfields at Vaenga or Yagodnik. The Soviet Government was not informed of this until 29 October, the day of the attack. No. 5 Group also requested that three Royal Navy destroyers be stationed along the return route from Tromsø to rescue the crews of any bombers forced down over the Norwegian Sea.