^ Me too. I am just making it up as I go along. So, will the walls go on the inside yet can't be pounded down as deep as usual and need braces to keep them erect? By 'usual', I am thinking of the levees in New Orleans... those corrugated steel things have to go 20'-30' feet into the sea bed? When it comes to cofferdams, none of this really make sense to me. Regardless, I love this mysterious construction stuff. Kieps mee shahp.