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Those I know do max one every other day, being support diver in the 'day off', which means they only go half way down ...
And in my book that is expeditionary diving not build up experience diving ... Unless yor are Doc Deep and then the outcome of that way of diving is now history.
I did not compare a +300' dive to the DD diving. I did compare multiple +600' dives in a day (subject of the thread) to DD diving (or even better pushing limits too far too quickly).
If you do buildup dives in the +300 range, in a sequence of multiple days one after another, you are calling for trouble in term of DCS, HPNS and slow compartment lack of desaturation. Also any dive in that range requires support divers. Who better than another diver capable to do those depth can better understand what it takes and provide support to the diver pushing the depth?
Any dive in the +300' is expeditionary in my book, let alone 600'. Even Dave Shaw, which was a very accomplished Rebreather Diver did a shake down 480 ft dive and then took a break before the push to recover the body, in which he lost his life to CO2 retention.
If you push too much too quickly and without the caution required to go in uncharted territory (not many studies on bounce dives beyond 100 mt published ... and none on dives done before complete desat ...) you are retracing DD steps. Just in my view.
But that is my view and I believe I am entitled to it, even because before strapping on a RB I was diving OC in the hypoxic TMX range.
High-pressure neurological syndrome (HPNS). - PubMed - NCBI
High-pressure neurological syndrome (HPNS) is a condition encountered in diving beyond a depth of 100 m. Manifestations include headache, tremor, myoclonus, neuropsychiatric disturbances and EEG changes.
[High pressure neurological syndrome]. - PubMed - NCBI
The nervous system is one of the most sensitive targets of high pressure. The high pressure neurological syndrome (HPNS) begins to show signs at about 1.3 MPa (120 m) and its effects intensify at greater depths. HPNS starts with tremor at the distal extremities, nausea, or moderate psychomotor and cognitive disturbances. More severe consequences are proximal tremor, vomit, hyperreflexia, sleepiness, and psychomotor or cognitive compromise.
You keep proving my point ... and these are peer reviewed publications.
And if you have been down there you will know it only start much deep than the guideline you provided.
Secondly 120m is 400ft, you keep moving the bounderies but I expected little more. Maybe go back and fix your previous response to read +400 ft when qouting HPNS.
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