🧵 Untitled Thread

Anonymous at Wed, 16 Oct 2024 00:45:23 UTC No. 16433683

There is a site where I have a feeling that it's hiding some sort of historical structure of sort. In a certain location, there is an open space surrounded by rocks and had also big rock in the middle. The surrounding rocks has tiny holes in them that could have occurred naturally. like 5cm diameter or less. But when we pour water in them they don't fill up no matter how many liters we put in, which mean they're airways leading somewhere vast and deep. Also geologist here could confirm or even share similar natural occurrences of caves having airways leading to the outside.
What I need /sci/ to help me with is to confirm/debunk the validity of my plan to figure out if the underground structure, either natural or human-made, has another opening close by.
My plan is
>use a shotgun microphone and isolate it with animal fat (poor-man budget) to make it capture only sounds from inside the holes.
> use oscilloscope app from fdroid to capture any tiny vibrations.
> make my friend hit the ground with a sladghammer in the vicinity and hope to catch a pulse when he hits the right spot.
My worry is that if the opening is burried too deep, soil is a badass isolator and I will never get any pulses even if I hit the buried entrance.
Also we tried a cheap Borescope but the holes take a sharp turn and we need an expensive one where you can control the head to push it further down.