2:05
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Throbbing of lawn mower engine starting up, idling and blades running then turning off
0:07
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Coarse throbbing low pitch rumble of spacecraft engine passing by at low altitude
0:40
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Dull, hollow, throbbing drone
0:32
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Swirling and throbbing drone, intense and scary
0:09
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Low pitched cyclic throbbing spacecraft engine, musical