someone has finally designed and commercially built a dual-valved snorkel, something I've been contemplating for years but haven't come up with a prototype. now someone needs to take it to the next level and extend it with long hoses to a surface unit with a dive flag, and people will be able to snorkel to any arbitrary depth.
last updated 2018-07-27 11:51:27. served from tektonic.jcomeau.com