Extended bombardment means that once the primary targets are bombarded, the artillery changes targets and begins firing into the deeper areas.
The shells won't suddenly land right where Gao Yang and his group are, because extended bombardment is gradual and orderly, not haphazard.
Whether or not they hit immediately isn't the concern; Gao Yang and his group quickly retreated into the basement. If a large-caliber shell happened to land nearby, it would be catastrophic. On the battlefield, every "coincidence" is just that—a coincidence. People hit by stray bullets, or even direct hits, often just have bad luck, getting coincidentally struck by a bullet.
The group entered the basement and, after less than five minutes, felt intense vibrations inside.
Rebrov lifted his head and shouted, "The bombardment has begun!"
Even in the basement, the loud explosions were audible, albeit somewhat muffled. Gao Yang checked his watch and spoke in a raised voice.
