Range is something which can't be locked down to a single number. Because of the complex properties of sound transmission through water involving layers created by several means: Temperature, salinity, contamination, density pressure, and transmission frequency (sounds can be wide-band with some of the sound traveling a few feet and other parts of the same transmission traveling for miles) distances are highly variable from a few feet to many miles. Layers can propogate at various speeds. Some sound can arrive by direct line-of sight while others can be reflected once or many times. You guys are never going to have perfectly historical reproduction.
You also need to realize you can lose sound contact as much from diving (in the real world) as you can from surfacing so I say take what you can get.
Keep in mind the game was created to provide a certain amount of minimum activity so players will actually have something to do once in a while.
-Pv-
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