However, the mechanical sparrow was small and extremely agile, and under Yan Fei's control, it easily passed through the 200-meter-long narrow passage, then discovered a very spacious hemispherical cave on the other side.
The volume of this hemispherical cave was huge; the height was over 20 meters, and the radius was at least 50 meters. Moreover, the ground was surprisingly flat, able to accommodate hundreds of people moving around inside simultaneously. On the cliffs next to the hemispherical cave, there were also several passages leading in all directions, but it was unclear where these passages actually led.
Thanks to the communication capabilities of the global satellite system and the use of enhanced communication technology by the mechanical sparrow, even after it entered the belly of the mountain, Yan Fei could still connect to the mechanical sparrow through the satellite system and see the specific conditions inside.
