111 additional in just 9 years! Not too many then to threaten a carrier, one torp and goodbye "moveable airfield" a lot of resource concentrated in a very small space. Now does that sound sensible? Didn't we learn that lesson about dispering your assets. I guess the Navy is totally confident in its ASW assets being 100% effective, logically it seems close to madness!
This logic can be quite easily turned on it's head: 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.
Excuse me General / Air Marshal we have a possible sub with tomahawk threat. Ok launch all anti sub assets while we move away from the .... oh bugger.