Or maybe something like that... source that I gave you (that web page in Russian) claims that operational/max depth of Alfa is 350/400m.
From other sources we know that safety factor used by constructors of submarines is 1.5 in US, 1.75 in Russian designs, and as much as 2.0 in German subs.
400m * 1.75 of safety ratio gives 700m. So maybe 700m was the crush depth of Alfa ? Is that possible explanation, Kapitan ? Or you are sure that the 700-750m were for operational or max value, not crush ?
Similar calculation would indicate that 675m diving depth you cited for Akula subs multipled by safety factor of 1.75 would give over 1000m crush depth, don't you think it's too much ? That 675m depth was operational, max diving or maybe crush ? But again I think only insane captain could dive to his boat's crush depth or even to 90% of it...
Do you know what is design safety factor of Russian built submarines ? Maybe you know another value ?
And the last thing, are you still sure that Alfa is the sub that keeps world speed record ? :-) Not the Papa class with 44.7kts ?
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