5 ms·

I scuba dive. Sound travels much faster and farther underwater. Initially, being underwater, it is very quiet. Then you start hearing all the noises: snapping,

I scuba dive. Sound travels much faster and farther underwater. Initially, being underwater, it is very quiet. Then you start hearing all the noises: snapping, popping, and scraping. The snapping noises are from shrimp. Other noises, I don't know. Maybe the same principle is at play.

samstave 5y ago
If you have ever scuba/snorkeled near coral, the groupers are the loudest with their beaks picking at the corals... The first time I heard it I was stunned just how loud it was. Can you imagine being a sound deadening-engineer designing subs? Thats some impressive capability. Recall the pic of the sub that collided with a (chinese) sub: https://imgur.com/a/Pa5cLYz https://imgur.com/a/Pa5cLYz I'm not one to deep dive into sub design, but that looks like a lot of sound damping material to me...
- ceejayoz 5y ago
  It hit a seamount, not a Chinese sub. https://en.wikipedia.org/wiki/USS_San_Francisco_(SSN-711) https://en.wikipedia.org/wiki/USS_San_Francisco_(SSN-711)
  - samstave 5y ago
    I am very familiar with the official story! I also watch anything and everything I can about subs, and the unofficial story was a chinese collision... A man can dream...
    - drsnow 5y ago
      Why do you dream of that?
      - samstave 5y ago
        I should have used the word 'imagine' or 'speculate' -- the point is a a $4 billion dollar nuclear sub with some of the greatest secrets of our military isnt just going to tell us what happened... They claim it was a previously unmapped under-water land mass and the cover story was that it could have grown from the crust since the last time we mapped there.... This was in the south china sea correct? and we have seismic sensors everywhere, a lot in that region due to Indonesia's propensity to quake... (My brother is a COlonel - I don't take the official story regarding the military - and especially subs...
        ceejayoz 5y ago
        No, “in the vicinity of the Caroline Islands” is quite a ways from the South China Sea. 2-3k miles. We haven’t come anywhere near mapping the entire ocean, and seamounts can pop up quite quickly. https://www.smithsonianmag.com/smart-news/underwater-eruption-off-frances-mayotte-island-gave-rise-to-a-new-colossal-seamount-180978918/ https://www.smithsonianmag.com/smart-news/underwater-eruptio... > In 2018, seismometers around the world detected mysterious rumbles emanating from a usually quiet area in the Indian Ocean between Comoros and Madagascar. At the time, researchers were astonished to find a 2,690-foot-tall underwater volcano, which is about 1.5 times the height of the One World Trade Center in New York. As with most conspiracy theories, this one falls apart on even casual examination.
edgyquant 5y ago
Doesn’t sound travel slower underwater?
- EGreg 5y ago
  Nope. MUCH faster
  - toss1 5y ago
    Yup The speed of sound in air is ~340 m/s, in water ~1,430 m/s, and in steel ~5920 m/s.
- sethammons 5y ago
  Upvoted to help un-gray your comment. Questions should not be downvoted. Welcome to todays 10 thousand: https://xkcd.com/1053/ https://xkcd.com/1053/
- JaimeThompson 5y ago
  Typically the more denser the medium the faster sound travels.
ljp_206 5y ago
Literally just returned to my rental after snorkeling Molokini. Hearing whales sing while listening to fish munch on the reef was incredible.
- ncmncm 5y ago
  The Hawaiian name for the local parrotfish is humuhumunukunukuapia'a, which translates to "fish that snorts like a pig".
  - ncmncm 5y ago
    That should be "humuhumunukunukuapua'a". Damn auto-correct.

samstave 5y ago

If you have ever scuba/snorkeled near coral, the groupers are the loudest with their beaks picking at the corals... The first time I heard it I was stunned just how loud it was. Can you imagine being a sound deadening-engineer designing subs? Thats some impressive capability. Recall the pic of the sub that collided with a (chinese) sub: https://imgur.com/a/Pa5cLYz https://imgur.com/a/Pa5cLYz I'm not one to deep dive into sub design, but that looks like a lot of sound damping material to me...

ceejayoz 5y ago
It hit a seamount, not a Chinese sub. https://en.wikipedia.org/wiki/USS_San_Francisco_(SSN-711) https://en.wikipedia.org/wiki/USS_San_Francisco_(SSN-711)
- samstave 5y ago
  I am very familiar with the official story! I also watch anything and everything I can about subs, and the unofficial story was a chinese collision... A man can dream...
  - drsnow 5y ago
    Why do you dream of that?
    - samstave 5y ago
      I should have used the word 'imagine' or 'speculate' -- the point is a a $4 billion dollar nuclear sub with some of the greatest secrets of our military isnt just going to tell us what happened... They claim it was a previously unmapped under-water land mass and the cover story was that it could have grown from the crust since the last time we mapped there.... This was in the south china sea correct? and we have seismic sensors everywhere, a lot in that region due to Indonesia's propensity to quake... (My brother is a COlonel - I don't take the official story regarding the military - and especially subs...
      - ceejayoz 5y ago
        No, “in the vicinity of the Caroline Islands” is quite a ways from the South China Sea. 2-3k miles. We haven’t come anywhere near mapping the entire ocean, and seamounts can pop up quite quickly. https://www.smithsonianmag.com/smart-news/underwater-eruption-off-frances-mayotte-island-gave-rise-to-a-new-colossal-seamount-180978918/ https://www.smithsonianmag.com/smart-news/underwater-eruptio... > In 2018, seismometers around the world detected mysterious rumbles emanating from a usually quiet area in the Indian Ocean between Comoros and Madagascar. At the time, researchers were astonished to find a 2,690-foot-tall underwater volcano, which is about 1.5 times the height of the One World Trade Center in New York. As with most conspiracy theories, this one falls apart on even casual examination.

edgyquant 5y ago

Doesn’t sound travel slower underwater?

EGreg 5y ago
Nope. MUCH faster
- toss1 5y ago
  Yup The speed of sound in air is ~340 m/s, in water ~1,430 m/s, and in steel ~5920 m/s.
sethammons 5y ago
Upvoted to help un-gray your comment. Questions should not be downvoted. Welcome to todays 10 thousand: https://xkcd.com/1053/ https://xkcd.com/1053/
JaimeThompson 5y ago
Typically the more denser the medium the faster sound travels.

ljp_206 5y ago

Literally just returned to my rental after snorkeling Molokini. Hearing whales sing while listening to fish munch on the reef was incredible.

ncmncm 5y ago
The Hawaiian name for the local parrotfish is humuhumunukunukuapia'a, which translates to "fish that snorts like a pig".
- ncmncm 5y ago
  That should be "humuhumunukunukuapua'a". Damn auto-correct.