What is your reason for staying submerged the whole time? This severely limits your mobility I would say. Unless you are certain of sitting right in the middle of a chokepoint of sea-lanes you could be missing alot of contacts that pass by you. I prefer to stay moving surfaced and regularly dive to listen. I think that improved the odds a bit more of running into someone. But it is probably more dangerous in later years with increased airial surveilance.
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