Is it possible to locate the objects buried under the rock by using RFID technique
Yes, depending on the RFID type and depending on the amount of signal blockage from the rock. The active RFIDs have stronger signal and longer range.
https://skyrfid.com/RFID_Range.php
Rock/mountain can cause about 8-20dB signal loss.
https://www.digi.com/blog/post/long-range-vs-short-range-wireless-communications
Check my paper IEEE
Wireless communication modeling for the deployment of tiny IoT devices in rocky and mountainous environments
Yes it could be. Many RFID systems use magnetic coupling and it will work at the same range through non-magnetic rock as they do in air. The range is similar to the diameter of the coils used in the reader.
Yes it could be, i confirm ... for example using a RFID tag at 13.56MHz buried in dry or wet soil.
Conference Paper Estimation optimale de la profondeur d'un tag-RFID enfoui à ...
The range can be more than the diameter of reader antenna, about twice with an large area tag antenna.
https://www.rfidjournal.com/question/how-deeply-can-rfid-locate-buried-objects
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