For which you'll be much better off launching multiple missile for equivalent combined warhead mass. A single missile loaded with 20 tons of submunition is such an ineffective system. NK has much more adequate systems in service for that purpose, a lot of which were newly introduced in recent years.20 tonnes of submunitions would delete any ground-level attack.
Same can't be said for bunker busters.
Apples to oranges comparison. Hence there hasn't been any 20t submunition missile.
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