said sealing label is removed and {TAIL ~ low density gas} is re injected through {HEAD ~ said hole}; and 
said sealing label is removed and { TAIL ~ low density gas } is re injected through { HEAD ~ said hole } ; and
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH