Claud, hydrogen is the lightest gas in the universe— it floats straight to the ceiling and hides there where nobody can see it.

“H2ONU splits water into hydrogen and oxygen, and it stores the hydrogen in a pressure chamber,” he said, eyes moving from face to face. “Hydrogen is the lightest gas in the universe, and the sub’s atmosphere monitors won’t catch the seepage from that hose. It floats, it’s highly explosive, and it’ll collect in the overhead unseen—building up while the nanos keep splitting water until the device runs dry.” Kailani steadied a hand on Claudia’s shoulder and crouched beside her. “Claud, hydrogen is the lightest gas in the universe— it floats straight to the ceiling and hides there where nobody can see it.