A pulsing/warning sound that could either be from a submarine, flying saucer or a spacecraft. This could be used in many Science fiction or military scenarios and is almost 3 minutes long. Science Fiction, Intruder Alert Warnings
Description: A pulsing/warning sound that could either be from a submarine, flying saucer or a spacecraft. This could be used in many Science fiction or military scenarios and is almost 3 minutes long.
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