i recently came across this paper on the net, and would like to know if similar searches have been done in places like poompukar. if we can motivate some funded agency (or research workers) in this area, it may turn up many surprises!
There have been expeditions in Poompuhar as well as Dwaraka...Infact there is a British Explorer who claims the mahabs relics is older than what it is recorded in history
you can check these out at www.grahamhancock.co.uk