Soakedlontra
Contributor
Sorry Rich but I disagree. Tank bangers may be for getting attention to look at fish or hey look what I can do or hey lets go this way but if your dive buddy is having a serious problem requiring your attention they'll be far too busy to snap their tank banger. If you want to be good dive buddies and not just SOBs, then make your dive buddy plans in advance. Dive X far apart in side to side formation making eye contact every X seconds, etc.
I agree with ChillynCanada. Every time I tried to make noise underwater to get the attention of my buddy it never worked unless my buddy was right next to me...Maybe with a "foghorn" you can produce a decent audible sound underwater.
One time my buddy and I did this test: we took turns in pretending to be out of air and then we separated each other to a distance that we thought we were able to swim. We started off with a distance of 25 feet. It turned out that we had to reduce it several times until it got down to 10 feet!:depressed: Well, that day we learned at lot: our assumptions about distances and swimming without breathing air underwater crumbled like a castle made of cards, I will never forget it!
I wonder what would happen if all the recreational divers in the world did this simple test...
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