What are Bunker-Busting Bombs Used to Kill Hezbollah Leader?

Hassan Nasrallah, the general secretary of the Lebanon-based terror outfit Hezbollah, was killed by the Israel Defense Forces on September 27th. Over 80 bombs were dropped within a few minutes to assassinate Nasrallah and his associates. Reportedly, Nasrallah was hiding in a fortified bunker, 60 feet under the ground at the time of his assassination. What were these bombs that penetrated the bunker? Bunker-busting bombs! What are they? How do they operate? Does India have them? News9 Plus Decodes.