Network Rail is investigating a problem with a section of the new £80million Dawlish sea wall, less than three months after the structure was unveiled.
Richard Ward, from the Save Holcombe and Teignmouth Beach group, said: "This material is used for wetsuits and sports clothing. I can't understand why this has been used in construction, it's simply not fit for purpose and wholly unnecessary."
The sea will always win. The line should avoid Dawlish coast and have a Parkway on the other side of town.