Yeah no, your flash vids are bad. Not surprising, considering you started two days ago...But it's surprising you yourself think they are good. Most noobs are at least aware they are noobs

(nothing wrong with that!)
Water is a very good medium, you are absolutely right, but I refered more to the "human" spectrum in voicing and hearing. Shouting in air is more effective than shouting underwater. But you shouldn't really compare explosion shockwaves with sound, as shockwaves cause a way higher overpressure and usually a supersonic velocity (e.g. TNT has a detonation velocity of 6900m/s...)
Noise does NOT have mass, why don't you believe us? I tried to explain elaboratly, don't just ignore that

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Sound is mechanical energy and follows the basic laws of pyhsics. What it does have is a theoretical "mass equivalent" based on good ol' Einsteins e=mc² (which you probably won't understand either...)
And I'm German, not American, by the way...there are quite a few Europeans here at SSM...
