Re: Need answer to something I've always Wondered About
The reality is that the standard length of a snorkel is the max a normal human can breath underwater.
Even a 1' extension will not work. No amount of valves will change that without pressurizing the air. Snorkels are pretty uniform in length for a reason. There are no extra long snorkels available for the macho man (or woman).
"Any idiot can make a boat go; it takes a sailor to stop one." Spike Africa aboard the schooner Wanderer in Sausalito, Ca. 1964.