inflating: filling something with
air or gas
helium: the kind of gas they were using to fill the balloon
immense: very strong
a seam: the line where two pieces
of material join
to split: to break
aborted: stopped completely, not
to be continued
intact: not broken, in good condition
a structural failure: a problem with the way something
is built
overcome: if you overcome a problem,
then you deal with it and control it so that it is no longer a
problem
weather window: a period of time
when the weather is good enough to do something