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4 votes
2 answers
164 views

"AC" compressed air?

So, compressed air power is a Thing. Compressed air tools are reasonably common, and compressed air has even been delivered commercially as an industrial utility at times. But all existing compressed-...
Logan R. Kearsley's user avatar
5 votes
3 answers
277 views

How to hide this underground city from seismologists, oil prospectors, and ground surveying projects?

In my previous question Would this underground city be noticed by seismologists?, it was established that a Goblin city in one of my settings would probably not go unnoticed do to the meddling of ...
Nosajimiki's user avatar
  • 97.5k
15 votes
4 answers
2k views

Would this underground city be noticed by seismologists?

The setting is current day Los Angeles... except for the goblin city that exists beneath it. Its chambers range from about 500-2000ft underground and has a population of several thousand. A lot of ...
Nosajimiki's user avatar
  • 97.5k
11 votes
2 answers
2k views

How close to the Sun would you have to be to hear it?

Taken from this fascinating answer: The Sun is immensely loud. The surface generates thousands to tens of thousands of watts of sound power for every square meter. That's something like 10x to ...
Jimmery's user avatar
  • 6,081
10 votes
1 answer
251 views

Dissipating sonic booms

Alastair Reynolds is a contemporary sci-fi writer whose works often demonstrate a strong grip on science as it presently stands. Recently, I picked up his book On The Steel Breeze for a quick re-read ...
BMF's user avatar
  • 6,798
14 votes
1 answer
441 views

Planet-wide vocalizations: is there a natural limit preventing it?

Premise I recently recalled when the Chelyabinsk meteor crashed overhead in 2013. The pressure wave was immense. The infrasounds, as recorded by nuclear missile detectors, appeared to traverse the ...
Arash Howaida's user avatar
11 votes
7 answers
3k views

Underwater acoustic muffling/dampening and sonar evasion. Is a stealth torpedo possible?

So I have various factions with submarines and surface ships battling it out for control over various underwater resources. One of the rarer and more lethal weapons is a "stealth torpedo". It ...
Nathanael Williams's user avatar