 In Cambados, seafood is mostly collected in "O Serrido" or "A Seca", which is an area of water surrounding the San Tome Tower (see below) emptying out almost completely when the tide is low, leaving the perfect area for seafood collectors.Large groups of them, (mostly women, with a few exceptions once in a while) go when the tide is low with their buckets and tools to dig up the sand and collect seafood (clams, cockles, etc.