It's amazing how a little bit of science knowledge can impress ordinary people like us. Take a look at the video below.
It seems that they pumped in a type of gas which is heavier / densed than our normal Air then place a tin foil on top of it. Did a research on it, there are a few gases which is heavier and they are Argon, CO2, ethane (C2H6), propane (C3H8), butane (C4H10), all the Freons (CF4, C2F6, C2F4H2, CF2Cl2), and others.
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