Several times during the summer of 1997, the U. S. National Oceanic and Atmospheric Administration recorded an ultra-low frequency underwater sound using U. S. Navy "spy" sensors 3,000 miles apart.
1997年夏天，美国国家海洋大气局使用美国海军“间谍”探测器记录下了一段3000英里外水下的超低频声音。
Several times during the summer of 1997, the U. S. National Oceanic and Atmospheric Administration recorded an ultra-low frequency underwater sound using U. S. Navy "spy" sensors 3,000 miles apart.
1997年夏天，美国国家海洋大气局使用美国海军“间谍”探测器记录下了一段3000英里外水下的超低频声音。
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