If I hold a shell up to my ear whilst SCUBA diving - would I hear the land?
812724
Try it and let us know.  Is there an ocean deep enough for you to SCUBA dive, ICHI?
956289
Yeah, it will produce a compression wave in the air - which is the definition of sound.  It doesnt matter if someone is there to hear it or not.  A sound is still made.
411063
no: If no one hears it, it doesn't because sound is only vibrations in the air if our ear drums don't hear it.
614468
can you hear my answer?
621710
I think you can hold it longer underwater cause you have to for servivial. On land you can just breath through your nose.
809306
uhmm technically you would because a few reasons \n1ST I'm a skydiver and you are **required to carry an air mask on certain occasions.\n2ND if it rained 5 inches yesterday today it rained 4inches and tomorrow it rains 2-3 inches that's 12/13 inches and depending on the amount of time you spend in that area you could technically drown \nRachel
963225
Not sure, but it's actually pretty negligible. Even when you're firing the main gun while "buttoned up", your ears don't even pop.
874805
"Can you hear me now?"
773710
well, you don't have to open your eyes. you should be fine...if you can't open them, don't try. get goggles, maybe. otherwise, there isn't really a point in trying to open your eyes underwater.
834404
this might sound pretty gross...how about when you have a bunged up ear and then a bit of excavating reveals a big glob of wax. that is pleasure...
438161
Send down a SCUBA diver to look!  Just kidding.  Your idea to pump out the well and see what happens sounds good.  If you have a camcorder, you could tie it to a rope and lower it to the bottom to have a peek like in the movie Volcano.
314829
Hmm, I'm gonna guess, Sounds to me like a limpet, or a sea snail can be in that category. just a guess tho, I live on the beach lol
449694
Depends what you mean by "Blew" your eardrum.... in the worst case, you could have perforated it in which case you definitely can't go surfing and would be in a lot of pain... on the other hand, you may just have water jammed in there.. in which case, it has either come out by now or you will probably have an infection on  your hands.... (you can syringe your eardrums out yourself if it is just a matter of having water stuck in there... but this can go wrong and you can do damage like this) I would say get it checked out by a Doctor my friend
55037
You probably could, but other than the feeling of sadness, you wouldn't be able to see or hear it.  The water from your eye would just blend with the surrounding water.  Did you feel like you were crying underwater once, but couldn't tell, and that's why you're asking?
1030170
If you dove or swam to the bottom of the deep end the water pressure may have been enough to give you that clogged sensation.  The mechanism is basically the same as with the air pressure during a flight:\n\nBehind your ear drum is an air pocket - the middle ear - that is connected to the back of the throat by the Eustachian tube. That tube will open and close again when swallowing or yawning to equalize the air pressure in the middle ear to that of the environment around you. That is why it is often recommended to chew gum or suck on hard candy during take-off and landing.  \n\nFor some people, the Eustachian tube does not function properly, and when the pressure builds up, sound can be muffled and you might hear noises (like ringing) in your ears.  If the pressure does not resolve, it can lead to a build up of fluid behind the eardrum, which restricts its movement even more.\n\nIf your eustachian tubes are not functioning properly, which can be due to upper respiratory ailments like allergies, or a cold, or sore throat; and the pressure can be quite painful.  Some people take antihistamines and/or decongestants to clear the upper respiratory system. \n\nIf the pressure builds up anyway, you could try to force some air into the middle ear by holding your breath (pinch your nose if needed) and blowing gently and steadily for a few seconds to force air pressure through the Eustachian tubes into the middle ear.  This is called a ValSalva maneuver -- be careful not to blow too hard or you could damage your ears.\n\nAs other people have noted, there could also be fluid that is not draining from your ear canal, which could breed a fungus or infection (swimmers ear).  If it persists, or if you get any itching, pain, fever, or drainage from the ear, see a doctor.
235044
This is a tried and true question of Philosophy.  The way one answers shows how human-centered your viewpoint of the natural world is.\nSound is a phenomenon with definite physical, scientifically testable characteristics, e.g. displacement of air molecules; nevertheless, if a HUMAN is not around to hear the sound, does it count? If there is no eardrum to be impacted by the airwaves, is it even a sound? Well, I would have to say that the first person here today has it right-- this is Yahoo Answers. Anything is possible. Except sound.
1070726
If it is well controlled, yes.  If not, you are at serious risk for a lung injury.\n\nHere is why.  Asthma is an inflammation of the breathing passages.  This reults in anrrowing and can result in air being trapped (at leats for a short period of time).  At constant pressures, no problem.  But when diving the ambient pressure changes.  \n\nIf you filled a ballon half way full at 30 feet depth, when you surfaced the ballon would be fully inflated.  (The reverse is true as well).  The problem is what if the air inside a trapped space doubles in volume - it has to go somewhere.  Barotrauma is the result.  The ability to equalize these pressure is essential to SCUBA diving -- be it the lungs, inner ear or sinus.\n\nOne other wrinkle: SCUBA can trigger asthma.  Some asthma seems to be initiated by breathing in a bit of salt water (unlikely, but it could happen) or by exercise (like kciking against a current).  \n\nMy advice:  Consult with a doctor familiar with diving physiology. and your clinical history.