There were reports that Guru Nasrallah's body was undamaged and that the shockwave was the cause of death.
There is no way to verify this, but it is true that shock waves pose a threat underground.
In dense ground, shock waves travel many times farther than in air, so that when a 1-ton bomb explodes underground, the maximum radius of instant death caused by the shock wave is 200 meters or more.
For this reason, underground facilities are not safe at all from bunker busters, which can destroy deep inside with extreme ease.
To withstand a bunker buster attack, it is necessary to dig a long lateral tunnel in the mountains more than 500 meters deep underground.
To some extent, it is unavoidable that Hezbollah could not provide a sufficient number of tunnels in the mountains and had to dig them under the city.
Unless the facilities are very solid, tunnels in the mountains can be easily attacked and destroyed very easily because there are no civilians around.
Attack is the best defense.
The idea of defending and winning is not realistic.