[a fool in paradise]

This is a global phenomenon

https://www.theguardian.com/news/2020/jul/31/weatherwatch-apocalyptic-sky-sounds-baffle-experts
Weatherwatch: ‘apocalyptic’ sky sounds baffle experts
From celestial trumpets to ‘Darth Vader breathing’, mysterious noises from above have been heard around the world during lockdown

During the months of lockdown, people have heard and recorded strange sounds seemingly emanating from the sky. Some believe these are celestial trumpets heralding the apocalypse; there may be other explanations.

The sounds – heard in the US, Mexico, Slovakia, Italy, Brazil and Argentina – do not seem to correspond to angelic heralds. Some resembled aircraft noises when there were no planes flying. A sound in Bratislava was described as “Darth Vader breathing”, while a recording from Colorado was like a shrieking whistle. Another recorded over several evenings at Lake Garda was more of a vibration...

[dynachrome]

I’d be looking for that sound source with a few friends, possibly Mr. Smith, Ms. Wesson, Ivan Mosin, and Sir Nagant.

[who_would_fardels_bear]

When Cheney was president... er... veep, he got contractors to perform multiple explosions under his residence in order to create a secure bunker.

The neighbors were not happy.