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There is a lengthy discussion in the lower update at the link provided above. Seems that the sub's team had been written up for related shortcomings, and that a sounding might have been prudent after dropping in depth by an additional 125 feet. Also explains a lot more about chart use failures on that vessel. Well, it is an interesting read, but I've never been on a sub, so I don't know? http://ahoy.tk-jk.net/macslog/NuclearSubmarineUSSSanFra.htmlWhale Whisperer:Running a Fathometer in "Secure mode" is virtually undetectable by anyone in the vicinity of the vessel. You'd have to be directly under the transducer to hear anything at all. But going "Active" on sonar will be detected for miles which is what submarines avoid, to maintain their stealthyness.
Unfortunatly I worked on that same submarine before they set sail. When I returned home my friend told me to check out the news and was totally shocked! Submarines cannot visually see what's in front of them, but they do run their fathometer at predetermined intervals to help determine where they are on the chart.
The problem here In my humble opinion is the "Human Factor". How accurate was the chart (there's alot of ocean out there to cover)? How well was the ship's voyage planned out? Was the ship's path going over any shallowing water? Did anyone raise the flag about anything unusual on the chart?
How vigilant were the watchstanders? You can have all the latest technology within your disposal, but that equipment was developed by Humans, and humans are operating that equipment. Stuff happens, and it happens in this case more than you may think...