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There was Australian underwater breathing device, which used your leg movement as only powersource. As I recall it could do 5 meters.

Very splendid, except some dozen people managed to misuse it. Diving deeper and without small emergency bottle.

So it was banned for all eternity everywhere. Even Chinese have not rekindled this product.

The idea of using transparent container maybe a good idea. Some indicator when you are sucking only water.

Because I am fool, I tried to make my own. But gave up because breakages were indicated only by lung full of water, which tend to be fatal.

Kangaroos! Tragatschnig is Austrian, not Australian.

Original version was in 1988. I was bicycling Australia at the time and saw it on TV.

Could have been Austrian invention anyways, perhaps?