naval shipworm
... that the naval shipworm was responsible for great damage to the Netherlands' sea defences in the 18th century?
... that the <b id="mwB_o"><a href="./Teredo_navalis" id="mwB_s" rel="mw:WikiLink" title="Teredo navalis">naval shipworm</a></b> was responsible for great damage to the Netherlands' sea defences in the 18th century?