Underground cavity detection

[liudengyuan]

Dear friends, I want to detect a hole in the underground. The volume of the hole is about 1 cubic meter. Is there a simple and practical way?

[Koala]

ground penetrating radar

or a long thin rod pushed into the ground

[Funfinder]

Bulldozer, excavator, old building-plans with tunnels etc, Jeohunter,
industrial driller and endoscope-camera (inside of Egyptian Pyramids
used), dynamite, sledgehammer and perhaps a magnetometer works.

The other day I found a cavity inside an empty beer-bottle
60cm deep buried where a little spider lived inside. Ultra-rare.

Be careful what you dig out, it could be the virus of an ancient Pharao.

[kt315]

cavity detection is in old TM-808. it is also DISC mode. if you want big depth, 2-3m, you have to built big size TX RX coils and
do more distance between them.
we suck this matter from 2006 year. you see Ivconic is main in this, not 315. https://www.geotech1.com/forums/show...TM-808-White-s
some people are trying to do me Brilliant Member asking same questions by years. no success.

[WhiskeyTango]

I've worked with teams doing resistivity surveys to locate caves. GPR is probably a better technology for a 1m^3 void though

[kt315]

take a back on question. 'Is there a simple' he wants SIMPLEST way, GPR is not simplest.