Tman1 Tman1:
or at the least some sort of detection net and saying 'oops' I see you.
You have to have the ability to put a torpedo up the arse of any possible intruder.
Simple sonar nets just don't cut it, sure we can see them... but what are we going to do about it then?
Shake our finger? Say "tsk, tsk, tsk"? Warn them not to do it anymore or... we'll warn them again?