一旦探测器发出音频信号，潜水员就用软木浮标作上标记，待稍后进行挖掘。

Whenever the audio tone of the detector sounded, a diver would mark the spot with a white cork float and return later to excavate it.

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针对不同的媒体，如图像、音频、视频，讨论了各自的挖掘特点和主要挖掘内容。

Special mining methods and content of image, video and audio are discussed too.

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