This diving system lets “youre staying” submerged for 2 hours , no tank required – Digital Trends June 17, 2018 Scuba Diving Digital Trends This diving system lets you stay submerged for 2 hours , no tank needed Digital Trends Do you want a diving system that bridges the gap between scuba diving and snorkeling, minus the limitations of both? If so, a new Kickstarter campaign could be for you. Described by its inventors as the smartest and safest hookah-diving system around …