As far as I understand: a regular bubble of air, while undesirable, won't kill you. That's part of what the lungs are for, and in fact it happens in hospitals a

As far as I understand: a regular bubble of air, while undesirable, won't kill you. That's part of what the lungs are for, and in fact it happens in hospitals all the time. A very large bubble can kill you, but you need to put some serious effort [1]. [1] http://www.straightdope.com/columns/read/2866/can-air-injected-into-the-bloodstream-really-kill-you http://www.straightdope.com/columns/read/2866/can-air-inject...