On Sun, 8 Mar 2015 17:08:19 -0700 (PDT), True North
wrote:

We used to read stories of our previous class of diesel electric submarines getting within torpedo range of 'merican carriers. Didn't realize the newer Upholder class did the same thing.

BTW ..it was four submarines we took off British hands. Three are based in Halifax in various stages of operational readiness.

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Those guys are so good at submarine tracking and identification that
they probably knew they were coming 100 miles away. The propellor
and hull noise of every ship and sub is totally unique, just like a
finger print or DNA sample. There are world wide networks of
underwater microphones that track ships and subs everywhere. The
noise signature of every one is in a database.