Or, once sufficient junk has accumulated, a for-purpose boat could come over and transport the lot. Also, there must already be ways of getting garbage and con

Or, once sufficient junk has accumulated, a for-purpose boat could come over and transport the lot. Also, there must already be ways of getting garbage and construction debris out. I suspect the best approach would be a boat that would transport the stuff not three miles, but a longer distance to where scrap could be more easily handled. This would amortize loading/unloading costs over more miles. I would not be at all surprised if such centralized waste handling ports already existed; there are lots of islands there generating a constant stream of refuse.