Why are there giant concrete tunnels in the desert?

The Tsar Bomba is 2*10^20 times smaller that the collision of those two black holes, which makes it's energy output in terms of gravitational waves insignificant by comparison... True... but as was said in the interview, you need to also take into account the volume of the expansion of the gravitational wave to understand what fraction of the total energy actually reaches us based on the distance the event took place.

So, in a way, we should consider whether a nuclear explosion close to the Earth could affect space-time and be detectable by  Ligo based on the sheer energy-to-unit-of-volume that it would have once it reaches the detector. Right?