A mistake turned fatal and left a mother devastated after her two young children died while using helium-filled scuba tanks in a family friend's swimming pool. Knewz.com has learned that 9-year-old Zale and 7-year-old Saxon were in the pool when they unknowingly used tanks filled with 100% pure helium instead of oxygen.

A heartbroken mum whose two children drowned while using scuba tanks in a friend's pool has spoken of her "upset, anger and disbelief" in Florida

You can’t put into words the upset, the anger, and the disbelief’, says Suzie Dudas as she calls for investigation to be reopened

The guilt that you weren't there for your children, that you allowed it to happen, that you helped them to get into bathing suits.'