I have been following this closely on Cruise Critic. It is like a FreeRepublic site for cruising. There has been a lot of good links and info. This page of one thread:
Post 881 is of interest. Of course I'm not discounting the issue of power failure.
For your reference.
Interesting link. I can see some it, but I can't see where they discover the error so late that the only option is transit through that narrow passage. Maybe it's the Navy navigational training in me but a 180 back out to safe water while you figure out what the hell is going on is always an option.
He went for it ..... and learned it was not well charted, because no significant vessels sail thru it!!!!!
I have personal experience with this one (not my ship but one I was working with), absolutely believable.