Acoustic Methods

Acoustic waves behave differently to radar waves in that they independent of conductivity, but very dependent on the competence or solidity, of the material is passes through. In terms of surveys, acoustic methods work well in solid rock, or waterlogged materials, but behave poorly in loose dry materials like sands and desert soils. The method was used with some success by SRI International in the 1970's in the search for undiscovered tombs in Egypt. In a test of the method, operating from 5-10KHz, it was able to obtain echoes from the Tomb of Tutankhamen from a nearby tomb in less than 20 minutes. For more information see ;
www.ldolphin.org/egypt/egypt2/index.html
More recently, the method was used to investigate a rock face for possible man-made cavities behind it. Details of this project are client confidential, but the results were quite unambiguous and validated the use of the method for cavity location.

The use of acoustics in underwater exploration is well established and is analogous to radar in its processing and approach. IRC's core group of consultants does not have equipment or specialized knowledge in underwater projects, other than knowledge of the processing and physics of the technology.