North Carolina: waves washing up on beach, lapping against corroded iron pylons. At Harbor Island, the International Nickel Company is studying why sea water corrodes wood, metal etc. Test items are submerged in wooden moats full of running sea water. Testing station to check airborne corrosion. Piece of metal is cleaned in laboratory, prior to testing. Man looks at metal under microscope. Man walking on rooftop. Roof being checked for corrosion. Men studying various samples of metal.