air bubble

(Newser) - A wise decision by two expert divers saved both of their lives, though one of them had to hold tight for 60 hours, 130 feet below the surface, experiencing hopelessness and hallucinations. The BBC reports on the extraordinary ordeal of Xisco Gracia, who was diving with a partner Saturday off...

(Newser) - Never heard of the term “supercavitation”? China’s about to school us all with its announcement that it’s making progress on a supersonic submarine that uses this technology, theoretically giving the underwater vessel the capability to zip along at the speed of sound, reports the South China ...