[KenWittlief]

communcation within the drive team could be accomplished with something like the old air tubes they used on ships and in large factories

its really nothing more than hose and you speak into and listen to the other end. It should be possible to make a set for 3 or 4 people - and the headset would also block some of the crowd noise.

BTW - Morse Code - when you learn morse code your brain is in a different space. You can pick out morse code from a very weak radio signal better than you can hear a human voice, so in a noisy environment it would actually be easier to comprehend (if you had a lot of practice with it).

After using it for a while you dont hear beeps or dots or dashes, you hear letters, and if you are really good, you hear whole words

just like when you listen to english, you dont hear the phonics separately, and think to your self " that was the K sound, that was an E, that was an N -Oh, he said my name!" you hear the words as a whole.

-Ken (KG2ET) :^)