This one is very interesting.
It is a shaped charged based , multistage warhead system to defeat deeply buried hardened targets.
Following are the components of the deep penetration multistage warhead system
1. Precursor shaped charged warhead to defeat hardened sandwiched reinforced concrete layers with steel bar mesh and layers of reactive explosives.
2. Follow through deep penetrating warhead ( 2 types ) to punch through exposed compacted earth / rocks / concrete structures
Also they are looking at rocket propelled follow through deep penetrating warhead to allow penetration to even greater depths.