Pasta, thanks I'm very aware of submarine ops and there need for secrecy and stealth both in peace and conflict.
There must still be a way to allow for automatic release that is secure enough for one to not to just fall off and self deploy!
And yes in this case it may seem unlikely that any kind of rescue would have been possible, however knowing the exact location of the distress would have saved a lot of effort and risk to a huge search force mustered from all over the world.
Having an accurate last known position is vital for not just saving lives but saving time, money and risk to others.