Inquest continues into gas diving death

The inquest into the death of Andrew Thwaites is hearing more evidence into how the Fisheries Queensland director and his partner dived with carbon monoxide-contaminated air.

Mr Thwaites drowned at Cherubs Cave off the east coast of Brisbane's Moreton Island on August 10, 2016.

The Brisbane Coroners Court has heard Mr Thwaites' tank contained 2366 parts per million (ppm) of carbon monoxide as well as unusually high levels of carbon dioxide.

The tank believed to have been used by his partner Kelly-Anne Masterman was also contaminated with elevated levels of the dangerous gases.

Dr Masterman testified on Tuesday she suffered memory loss and a heachache for days after Mr Thwaites' death but initially thought it was from her grief.

"I felt physically sick, my head was pounding, I felt my guts were completely knotted," she said.

The court heard Mr Thwaites filled seven tanks from a compressor at the Underwater Research Group of Queensland clubhouse on July 13, 2016 and other members' tanks were also found to contain elevated levels of carbon monoxide and carbon dioxide.