Proof that few problems can't be solved with enough explosives.
Most modern warships are essentially unarmoured.Most warships have a ring of armour,10 metres @ 18" or more thick down to about 15 metres at 40", and that's not even a capital ship.
Mk XII (18 inch).we sent in Swordfish's with MK42's if I remember to put the fear of God up 'em!
Most modern warships are essentially unarmoured.
Passive systems are usually preferable as they don't give away your position to the enemy.
What characteristic of passive sonar did he work on?
Never heard of that phrase used before 'multi element'.
Well, I know some modern warships have thin skins to theoretically allow a missile to pass right through without detonating,
And Kursk class subs go for the opposite approach, a hydrodynamic outer hull, that will detonate torpedoes, so there is some separation between the detonation and the structural hull.
They embraced all manner of passive systems, and non-acoustic systems too. Signals that might be considered not significant if taken on their own can be given more confidence if they correlate to data from another source, and each source might not be able to give reliable data on it's own, but it's more reliable when correlated.
That's as much as I know (apart from the sources) but then I am security cleared to some extent and have worked on his computer systems, and really, I guess, that's as much as I should say. I guess you can guess what the other sources might be.