When Lemuria submerged during first Tamil Sangam, Then Madurai also got submerged.
Madurai is called as Naan Maada Koodal, city of Skyscrapers.
The traditional explanation of Naan Maada Koodal is what I have stated above.
The term Koodal is Tamil also means union , as in Husband and wife and also where Oceans meet.
In my opinion Koodal means where Oceans meet and this becomes clearer when one sees the landmass of Lemuria.