collectivity on all sources based on factual information which does include fas.org and other such sites
also included are people who have served on them yes all two of them
(i only kno two people who have worked on the al'fa class)
after i collect all the information i asses each individualy under non bias conditions and work out an average
i have sources claiming that the al'fa dives to 500 meters others 800 some even as deep as 3000 meters
its exactly what im doing with my kursk project only the kursk project "big red" is going to take alot longer so far i have spent 4 and a half years on it and im not even half way done