Ok, nvm. Let's get back to topic. You may wonder what is a blimp?! It's actually a free flying aircraft or airship which is non rigid in structure. This aircraft rely on both high pressure of the lifting gas inside the envelope and strength of the envelope itself. The concept that they use here is almost the same as hot-air balloon. So if you throw a hammer on it and it bursts, it's considered K.O. Here's some picture..
Actually It's More Than Half The Size of the Football Field
Luckily It Has Some Sense of Direction that It Didn't Bang on the 4-Storeys Building
Enjoy and have a nice weekend^^