Bab 459: 452

The weather balloon was delivered, along with several hydrogen bottles for inflation and a valve adaptor for filling the balloon.

Originally used by the meteorological soldiers of the aviation and missile forces to predict the weather, the balloon was neither large nor heavy, and could ascend carrying measuring instruments. Now, to attract the attention of the aliens, they could just continue using the instruments that came with those balloons.

Gao Yuan was tasked with carrying the gas bottles, which weighed a mere twenty kilograms for a forty-litre capacity, with the weight of the hydrogen inside being negligible. This weight was like a feather to Gao Yuan; had it not been for the bulky size of the steel bottles, he wouldn't have minded carrying ten or even eight of them on his back.