Kodungallur was under Sea till 800CE, Chera Vanchi is Karur. ASI Archaeologists honoured for his services.

Archaelogical Society of India Excavated Kodungallur in 1947, under P.Anujan Achan  and found articles of 14th century or later only.
KERALA CHURCHMEN AND POLITCIANS put on pressure showing the above referred Copper plate and wanted ASI do more detailed Survey  Archaeological Survey of India under Highly Reputed Archaeologists Dr.K.V.Raman and K.V.Saundararajan (1969-70) went for excavation . Archaeological sites such as
 Cheraman Parambu
Thiruvanchikulam
  Karuppadanna
  Mathilakam
  Kilatali
   Thrikkulasekharapuram etc.,  provided cultural remains of iron and copper tools, glass beads, semi precious stones, ceramics of dull red ware, celadon ware roof tiles, earthen lamps and coins. They are all dated between 900-1100 A.D...     Virgin Soil was found at this level
Dr.K.V.Raman published his research in a book and pages are below. Dr.Raman along with Dr.R.Nagasamy who proved Chera's Capital Vanchi was Karur 


ASI Recording in that year of the same.