Hypoxic & Shallow Water Blackout

Hypoxic and shallow water blackouts happen for different reasons and under different circumstances – one is due to a lack of carbon dioxide, the other is due to dilute oxygen levels that can occur while freediving. Watch as Dr. Joshua M. Tobin explains the difference, and find out how to prevent some underwater blackouts. Learn more at: https://www.redcross.org/take-a-class... #redcross #science