I also know of the title "Everest of deep/tech " and yes, I myself refer to the Andrea Doria as that.
The Andrea Doria is in its self not outwardly a hard dive (IF YOU ARE PROPERLY TRAINED), however several things make this a dive that requires detailed and meticulous planning, its main factor being its depth, and here is where I am sure I will draw much criticism for my comments: - Deep Diving on Air as we all should know is extremely dangerous and as we all know that diving on air beyond a depth of 60 meters (195 feet) can and will induces CNS toxicity, plus the effects of narcosis (the martini effect) at these depths become extreme.
The second factor of course is the fact that divers who dive the Doria Will/Do and Want to enter the wreck which returns to my point of narcosis…narcosis can disorientate even the most experienced of divers (of which I do not even pretend to be one), which leads to my third point… use of a real and line on the Doria should be considered a must…
My point to all this…Diving on any Wreck, Reef or any dive site beyond the PP (partial pressure) of 1.6 of O2 is a deadly combination.
But that’s just my view.
And too my final comment… anybody who has dived the Doria weather it be on Mix, Air or even to my complete and utter shock... free dived, I have the great respect and admiration for.