I would say no proper geological survey was done in the area. Normally before any major engineering project, GSI conducts engineering geological study, geological study, geo tectonic study, seismic study, etc so that we will know whether the project is safe or not.
You mean no such studies were done before this project?
Earlier, GSI had done some drilling but only at the deeper level of about 180-200 metres, but they have not mentioned anything about what was happening at the top portion.
We did a study from NIOT on our own connecting between Rameswaram and the international waters. We did around 10 bore holes along the Adam's Bridge alignment. Four of the bore holes were along the islands (where sands go on shifting) and six in the water.
Everywhere, after top 6 metres, we found marine sands on top and below that was a mixed assemblage of corals, calcareous sand stones, and boulder like materials. Surprisingly below that up to 4-5 metres, again we found loose sand and after that, hard formations were there.
How do you explain the presence of loose sand?
It shows the structure is not natural. I will explain. Corals are found only on rocks and such hard surfaces. Here, below the corals and boulders, we are getting loose sand, which means it is not natural.
And, on top of the loose sand, which was formed when the sea level was low, our divers found boulders. Boulders normally occur on land and they are a typical riverine character.
Image: The presence of loose sand substantiates the stand that the Ram Sethu is not natural.