dirdiversrule:They all dive deep air.
Maybe if Chatterton wasn't diving air all the time he would have identified the wreck correctly and Gentile wouldn't have had to write a book to set the record straight.
They dove deep air when that was all they had. All of them went to other air mixes when they became available and use them when they make sense. That is key. Mixed gases are a tool, as are rebreathers, and they use them when they're appropriate for the tasks at hand. To insinuate that only DIR divers achieve amazing things in technical diving is just plain ignorance or arrogance or most likely both.