On Tue, 14 Nov 1995, Jammer wrote: > > Therefore, the tanks need sufficient marking so that *I* know what depth > they are safe at, and so that *I* can identify the mix in them, and dive > them according to > *MY* plan. > Unless you dive solo, it is beneficial to have the tanks marked in such a way as to allow your buddy to see what you are breathing (in water). Unless all tanks used will contain the same mix, then its moot. As a human, and thus not omnipotent. You are capable of making a mistake. This gives you, and your buddy(s) the opportunity to catch a possibly fatal error. Darwin is dead.
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