Excuse me Captain we have a possible sub in the area. Ok launch all anti sub assets and send a few frigates to screen us while we move away from the threat.....
I would ask what anti sub assets, and what "few frigates"? Especially given that the cost of the carrier(s) and the F-35s have swallowed up so much of the defence budget that there is now no MPA cover and b*gg*r all ASW assets and frigates (how many Frigates have just been sold off, and how many will be purchased to replace the current Type 23s?)
Let alone the obvious question. How can you move away from the threat - UNLESS YOU ALREADY KNOW WHERE IT IS?? Unless you intend to vacate the entire theatre of operations? A submarine only tends to confirm its location when it puts a couple of torpedos into a high value unit, such as a carrier......