buzz buzz.

In the dark night, the stars are dim, and the red beacon lights that are constantly flashing are extremely dazzling.

Accompanied by the slow emergence of many huge combat airships, there are noisy and continuous mechanical buzzing sounds.

Below the increasingly clear cigar-shaped black outlines, there are extremely fast-rotating propellers, and the tail also has a rudder that can control the direction. These are the sources of the humming.

see these

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