I Found 100 Nuclear Missiles

Under the energy-saving mode, the UAV formations cruising speed was 380 kilometers per hour. They flew in a straight line, and in about 10 hours, they completed the journey of more than 5,000 kilometers.

Chen Jin put Alice in charge of controlling the UAVs and returned to his bedroom to rest.

...

The next night, he returned to the Base of Operations. Looking at the virtual projections, Chen Jin was struck dumb with astonishment as his mouth opened wide in shock. The Intercontinental Exploration Squad had relayed a portion of images after completing part of the exploration on Europa continent.

What kind of rewards did they reap? An undamaged large-scale city? An excellent industrial system? Or a castle, museum, winery, or other such cultural legacies?