'In 1978, 3 men set a record flight duration of 137 hours in The Double Eagle II balloon, which used this gas'
helium
FLY ME WITH BALLOONS: In 1978, 3 men set a record flight duration of 137 hours in The Double Eagle II balloon, which used this gas
In 1978, 3 men set a record flight duration of 137 hours in The Double Eagle II balloon, which used this gas
In 1978, 3 men set a record flight duration of 137 hours in The Double Eagle II balloon, which used this gas
FLY ME WITH BALLOONS
helium
FLY ME WITH BALLOONS