They already are, actually: European researchers retrofit snorkel masks for coronavirus fight - https://www.reuters.com/article/us-health-coronavirus-czech-snor

They already are, actually: European researchers retrofit snorkel masks for coronavirus fight - https://www.reuters.com/article/us-health-coronavirus-czech-snorkel-mask/european-researchers-retrofit-snorkel-masks-for-coronavirus-fight-idUSKBN21H2Z5 https://www.reuters.com/article/us-health-coronavirus-czech-...