This isn't a good thing at all.
It's about measuring the distance to the nuclear mushroom cloud.
Thumb extended towards the distant mushroom cloud, if the thumb covers it, it means you're far enough from the nuclear blast center, and there's still time to desperately flee and find shelter.
If the mushroom cloud isn't covered by the thumb, then it simplifies matters; just keep smiling with hands on hips, leaving behind a dashing shadow will do.
And since Oppenheimer made this gesture.
It means the mushroom cloud has appeared.
The experiment was a huge success.
Perhaps Tang Qing's gesture was too professional; at this moment, Li Qingming really felt as though he saw a mushroom cloud slowly rising, revealing a relieved smile.
He then picked up the walkie-talkie:
"Have everyone gather on the deck, get ready for what you have to prepare, Captain!"
"Guaranteed to be done within 10 minutes!" Mai Tao immediately followed up with a question, "About the command authority..."