x Megaton Bomb Balloons are a type of inflatable that replicate the catastrophic expansion of nuclear bomb detonations. They come in a range of two variables: size of TNT equivalent yield (the megaton factor); and time in nano-seconds after detonation.
They are inflated by simply blowing air into their interior regions, in the usual manner, but the balloons' material composition is not uniform, having been carefully structured to expand and contort and elongate to eventually replicate a fully formed mushroom cloud. (if that option was selected) Others may choose a balloon that replicates the colours and globular shape that occur a nano- second after detonation. (see link images)
With the activation of an internal LED, you have a nice party balloon for those attracted to all things connected to Armageddon.-- xenzag, Mar 16 2017 https://s-media-cac...4bfbf16c5e2e84a.jpg nano seconds after H bomb detonation [xenzag, Mar 16 2017] Mushroom cloud umbrella Mushroom_20cloud_20umbrellaPrior Art [8th of 7, Mar 16 2017] Aleutian underground test https://www.youtube...watch?v=rtH0EDLcbwA [not_morrison_rm, Mar 17 2017] "Life size", presumably ?-- 8th of 7, Mar 16 2017 Ha ...... how is an umbrella the same as a balloon? Silly.-- xenzag, Mar 16 2017 ... like Hiroshima.-- 8th of 7, Mar 16 2017 ..or the Aleutians. Most spooky video of underground detonation, as you can see something mega has happened, but no mushroom cloud. Link-- not_morrison_rm, Mar 17 2017 That Aleutian test looks impressive but it wouldn't come close to the spread of a large earthquake Megaton event.-- wjt, Mar 18 2017 random, halfbakery