Diver one of sixteen to die using high-tech gear

[DRE]

"In the 5th paragragh David Crockford said the unit was functioning properly after it was recovered from the seabed several days later. If Nicholas was breathing from the unit when he went unconscious and he was found on his back by his buddys. At that point the mouthpiece would have been open, all the gas would have escaped and the breathing loop would have been flooded. With the loop flooded the Sodasorb would have turned to a caustic coctail and all 3 02 sensors would be ruined. It would be impossible for the equipment to function at all."

So you explained the first part of the paragraph, but what about the second:
"However, Mr Crockford said it was interesting to note Mr Gotto¹s diving partner or others among the party-of-six did not witness an alarm-warning sound from the deceased man¹s hi-tech equipment," plus the fact that it wasn't established whether it was hypercapnia or hyperoxia - so my problem is still the same, the guy died and apparently there wasn't enough warning to allow him to do something about it...