What is the scientific explanation for the rumble noise inside Devil's Cave system?

Doing the Intro to Cave Diver Course last year at Devil's Eye, I heard this rumble noise that I though were produced by other divers passing us using scooters. Later, the noise came back again and no divers around; then, I though the cave was collapsing at some point.

After having more than +500 minutes diving this system, I'm getting used to it; but, I would like to find a scientific explanation for the noise. The only information I have is that it is created by the water flowing and changing pressure.

Has anybody can provide some more information or a place (internet), book, etc where to learn more about it? Does each submerge cave have unique sounds? Can you hear the noise deep inside this cave, from where it is coming?

Thanks in advanced!

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Originally Posted by Leandro

Doing the Intro to Cave Diver Course last year at Devil's Eye, I heard this rumble noise that I though were produced by other divers passing us using scooters. Later, the noise came back again and no divers around; then, I though the cave was collapsing at some point.

After having more than +500 minutes diving this system, I'm getting used to it; but, I would like to find a scientific explanation for the noise. The only information I have is that it is created by the water flowing and changing pressure.

Has anybody can provide some more information or a place (internet), book, etc where to learn more about it? Does each submerge cave have unique sounds? Can you hear the noise deep inside this cave, from where it is coming?

Thanks in advanced!

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I used to hear it as well...then I started clearing my ears and it goes away every time....it is a pressure thing in your ears or so I think...I am certainly no expert and just sayin what works for me. Bill

Is it not the air on the ceiling? I remember Edd telling me years ago (maybe '09 / 10 time frame) about someone doing a study on this. They had placed some recorders in some of the Mill Pond caves. He told me who it was but I don't remember. He might though and the study would be interesting to see. I think the person had even got grant money to do this research.

I've heard that, mostly near the bone room line jump, and I told myself after listening closely that it was actually the sound of the water moving through the cave.
I was in Little River a couple weeks ago and distinctly heard (two different times) a boat engine speeding up some 90 feet above me. Hadn't heard that before.

my band practices in the white room.

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Originally Posted by wingman

I used to hear it as well...then I started clearing my ears and it goes away every time....it is a pressure thing in your ears or so I think...I am certainly no expert and just sayin what works for me. Bill

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L.O.L.

I stop hearing the noise some time ago; but, last weekend, I did my first solo dive and the noise came back. This time, I decided to find out what it is going on here.

I'm not a scientist, but I'm pretty sure it is the bubbles rolling along the ceiling. I used to hear it all of the time on open circuit and thought it was the water moving. Now that I'm on a CCR, I don't hear it anymore unless there are open circuit divers around.

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Originally Posted by LiteHedded

my band practices in the white room.

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ROFLMAO


"Never doubt that a small group of thoughtful, committed citizens can change the world; indeed that is the only thing that ever has."
- Margaret Mead, Anthropologist

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Originally Posted by alcornl

I'm not a scientist, but I'm pretty sure it is the bubbles rolling along the ceiling. I used to hear it all of the time on open circuit and thought it was the water moving. Now that I'm on a CCR, I don't hear it anymore unless there are open circuit divers around.

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I've heard this same explaination from more than one source.

Bubbles on the ceiling definitely make noise. So do powered boats in the river.

Trolls. Albino cave trolls. I used to see them all the time, but then I quit diving air at 200 feet.

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Originally Posted by OFG-1

Trolls. Albino cave trolls. I used to see them all the time, but then I quit diving air at 200 feet.

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That's believable!


"Never doubt that a small group of thoughtful, committed citizens can change the world; indeed that is the only thing that ever has."
- Margaret Mead, Anthropologist

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Originally Posted by Leandro

Doing the Intro to Cave Diver Course last year at Devil's Eye, I heard this rumble noise that I though were produced by other divers passing us using scooters. Later, the noise came back again and no divers around; then, I though the cave was collapsing at some point.

After having more than +500 minutes diving this system, I'm getting used to it; but, I would like to find a scientific explanation for the noise. The only information I have is that it is created by the water flowing and changing pressure.

Has anybody can provide some more information or a place (internet), book, etc where to learn more about it? Does each submerge cave have unique sounds? Can you hear the noise deep inside this cave, from where it is coming?

Thanks in advanced!

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What did you have for lunch??? Hmmmmm???

Doing CCR deco, when OC divers are exitting it sounds like a freight train going by from bubbles rolling on the ceiling.

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Originally Posted by LiteHedded

my band practices in the white room.

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...with black curtains, at the station?

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Originally Posted by OFG-1

Trolls. Albino cave trolls. I used to see them all the time, but then I quit diving air at 200 feet.

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Then the trolls moved to the internet

It is the bubbles migrating along the ceiling.

I've heard it in Orange Grove too, I always assumed it was cars passing nearby overhead... possible?

The sound comes from gas bubbles moving through the hair cracks in the rock and expanding as they race towards the surface. The strength of the expanding gas is strong enough to make the rock produce the crack/rumble. Depending on the quality of the rock, sound can be very loud or not. Some caves in France are extremely loud and it sounds like train is passing over you all the time.

AFAIK. there is no correlation between cave stability and this rumbling sound.

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Originally Posted by Captain Bil

...with black curtains, at the station?

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ha!

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Originally Posted by LiteHedded

my band practices in the white room.

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You play with Cream? That's awesome! My band is "Skim Milk." We play light rock.

Air Bubbles on the Ceiling make a Rumble Sound that my Wife can't stand. My Wife and I were Cavern Diving Orange Grove and we were watching some Cave Divers come out from the shallow tunnel and our bubbles were moving on the ceiling making a noise that she felt uncomfortable.

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Originally Posted by erdcphotoman

Air Bubbles on the Ceiling make a Rumble Sound that my Wife can't stand. My Wife and I were Cavern Diving Orange Grove and we were watching some Cave Divers come out from the shallow tunnel and our bubbles were moving on the ceiling making a noise that she felt uncomfortable.

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She has good instincts. In unstable caves, those air bubble rumbles can (and sometimes do) cause serious percolation, and even rock fall.

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Originally Posted by FW

She has good instincts. In unstable caves, those air bubble rumbles can (and sometimes do) cause serious percolation, and even rock fall.

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Especially if those bubbles make it up into a fissure that holds debris. Won't cause a collapse,but will look like Niagra falls.

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Originally Posted by erdcphotoman

Air Bubbles on the Ceiling make a Rumble Sound that my Wife can't stand. My Wife and I were Cavern Diving Orange Grove and we were watching some Cave Divers come out from the shallow tunnel and our bubbles were moving on the ceiling making a noise that she felt uncomfortable.

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Hopefully your wife doesn't read Forrest's comment below. :-D

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Originally Posted by FW

She has good instincts. In unstable caves, those air bubble rumbles can (and sometimes do) cause serious percolation, and even rock fall.

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And shame on you Forrest, if she does. :toimonster:

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Originally Posted by Michael F

Hopefully your wife doesn't read Forrest's comment below. :-D



And shame on you Forrest, if she does. :toimonster:

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Is his a case of being too PC? One should never say things that might make somebody uncomfortable, whether they are true or not? It worries me that there is a growing tendency to want to live in a bubble (so to speak) where all things are sweetness and light.

Yeah, likely air. Now if you want to hear a real rumble check the Amtrak schedule and dive Edwards...

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Originally Posted by tursiops

Is his a case of being too PC? One should never say things that might make somebody uncomfortable, whether they are true or not? It worries me that there is a growing tendency to want to live in a bubble (so to speak) where all things are sweetness and light.

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Tursiops,
I think Michael might have been joking a bit, although I agree that the political sensitivity BS is a bit out of control these days, I don't think that's what he was going for.

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Originally Posted by reefman24

Tursiops,
I think Michael might have been joking a bit, although I agree that the political sensitivity BS is a bit out of control these days, I don't think that's what he was going for.

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Ok, thanks. I guess he hit my hot button, which obscured my sense of humor.