The boat sank on the night of December 12, 1770 – since then its origin has been shrouded in mystery – it was initially thought to be part of the fabled Spanish Armada, but this has been ruled outThe mystery of the "Butter Boat" shipwreck has finally been solved 250 years after the ship sunk. After the remains of the boat were found off the coast of Ireland, its true origin has finally been discovered. The skeletal remains of the large vessel become visible when the low tide shifts – for years it has attracted curious tourists, reports The Mirror.....