It was local time, September 18th 2021 when the international joint unit reappeared at Isla Salas y Gomez. At 18:12 of the same afternoon, the rescue team started the ECMO surgery on Gu Jun; his heart regained function at 18:37. His EF, or Ejection Fraction, a measurement of how much blood the left ventricle pumps out with each contraction, stayed a dangerously low 10 percent for the standard value is at 50 to 70 percent. Due to massive haemorrhage in his right parafrontalia, the team of neurosurgeons led by Si Kouxian conducted a craniotomy on Gu Jun at 18:42. The incision was made and the skull drilled to remove carene, cerebral dura and clear away blood clots.