Hi, I want to know wt is the best sensor used to detect metals, cavity and water at high depth up to 10 meter.
I got lost between the type of sensors and concepts and I can't identify wt is the many type of sensors that I have to search for.
thanks
CK
you want to detect water at high depth in sea or in backyard ?
I want a sensor to get the underground signal then analyse it using 3d diagrams to identify metals, cavity and water underground not in sea, I know these type of devices use electromagnetic field, send signal then receive it and analyse the difference in signal using each material resistance to identify underground levels.
thanks for the schema diagram 
such device will find metal in your hands and pockets, find water in your body and find huge cavity above the ground.
Do you mean distance from detector to object or cavity?
If so, talk to archeologists about ground penetrating radar and gravity gradient imaging.
many devices can do wt I need and they are sold for over one thousand, I want to understand their concept and wt type of sensors or amplifiers are they using
do archeologists design and make these devices ?!
I want to understand wt type of sensors or amplifiers does these devices use
No, archaeologists, among other people, use the devices to locate things (or cavities) underground. Your favorite search engine will point you to more information.
The "best sensor" is the one that meets all of your requirements, and performs better than the others that also meet your requirements.
I would say archeologists are an important part of designing, and an involved part of the making the detectors, but only to ensure the product is functional when in their hands.
thanks everyone for ur replies but my question isn't related for archeology, it's pure electronic and physics question.
wt is the best electromagnetic sensor to put on arduino that can reach deep underground depth
Ground resistivity, magnetometry, ground penetrating radar.
All depends on the ground composition, depth, the size and composition of what you're trying to find or ignore ...
You're asking a very broad, and ill-defined question.
lets say Electromagnetic Field Metal Detecting Sensors, does anyone have experience with these types of sensor and can recommend a brand or model that can do a deep scanning underground, not few cm, at least 5 to 10 m
Hi, @cekay137
Read this as a start to metal detecting and the equipment used.
The deeper you want to go, the bigger and more complex the equipment needed, 5 to 10m would be extremely difficult.
Here ia commercial unit, not cheap that has to use multiple technologies to attain a reading to 30m.
Can you please tell us your electronics, programming, arduino, hardware experience?
Thanks.. Tom.. 
Plus the motivation here - why are you interested in this and what problem are you looking to solve ?
(I ask as there may be other routes to solve it )
It strikes me that this is a very difficult task and you’ll need expensive complex equipment to solve it .
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