Repeating this important piece of information for those who keep asking "but what about the discrepancy with the charts" or "why weren't they using sonar" or any of the other questions.
This is the failure of the Captain to pay attention to the information that the sonar ping gave him.
As I said before, "Fair winds and calm seas", CDR Mooney.
This reply is the best that I have seen on any of the threads relating to this subject. Thanks, there sem to be alot of armchair admirals around.