WEBVTT

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- We have a tour coming through.

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This cave is actually a working
cave, a working show cave,

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and there's a tour group coming on, yeah.

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Hey now, you're safe, I promise.

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You can walk through there if you like,

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just be careful of the mic.

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If you look up that way you can see one

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of the pieces moving, you'll see it.

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(gentle piano music)

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The sound that you're hearing is coming

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from the stalactite pipe organ.

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It's actually the largest
musical instrument in the world

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and it's covering over
three and a half acres.

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There's over five miles just of wires

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running to make this thing work.

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It took them a full three years to build

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and they started back in 1954.

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There are little small
electronic mallets that strike

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the stalactites, and they had
to find the right ones to make

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the right sound, and that's
why it's spread out so far.

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They had to find the right one to hit it,

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make a little vibration,
and then little microphones

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pick that up and it's tuned
actually to the concert pitch.

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(gentle piano music)

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- [Woman] Alright, if
you guys could follow me.

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- [Man] Thanks, Allison, for
bringing your group through.