hardie said...It'd never happen but imagine building something like that on the Peel estuary covering winter storms and the summer seabreezes

Start building Hardie, one rock at a time, slowly slowly and no-one will notice, then one day there it is, "Hardie's Speed Run".
It's doable (is that really a word?) a big pile of rocks & a dinghy, it's possible

Once it's there how can they get rid of it?