----quote----
Deep sea photography, recovered artifacts, and an evaluation of her design and operational history permitted a Court of Inquiry to conclude Thresher had probably suffered the failure of a joint in a salt water piping system, which relied heavily on silver brazing instead of welding; earlier tests using ultrasound equipment found potential problems with about 14% of the tested brazed joints, most of which were determined not to pose a risk significant enough to require a repair.
----quote----

the above information was obtain from http://en.wikipedia.org/wiki/USS_Thresher_%28SSN-593%29
you can read the page to understand the full story you can also check this link to verify what was the cause of the disaster.
http://www.arlingtoncemetery.net/uss-thresher.htm

And yes it did descend to crush depths by accident.
Source(s):
http://en.wikipedia.org/wiki/USS_Thresher_%28SSN-593%29

http://www.arlingtoncemetery.net/uss-thresher.htm

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