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The '05 tripod noises are meant to sound like V1 bomb scare-sounds, which is originally made to sound like mythical Horns of Jericho:

https://www.factmag.com/2016/10/09/sound-fear-room40-boss-la...

Listen to the V1 bomb sound in the clip on that page - there's no surprise they're being referred to in following works of fiction.

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V1 sound comes from the pulse jet engine that runs with a "batch mode" cycle, ie there's a valve at the front that opens and closes at something like 30 Hz.

The Stuka had the scare sound siren and it had a much higher pitch.

Huh, that’s neat. You can definitely see the influence of that sound then following on into Inception which seemed to really popularise it.

It's always been around. In fact it's been very popular in games like the Modern Warfare series, which have major popular appeal.

Those were definitely not a big deal (compared to now) and were a very different game back in ‘05

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