The small landing craft belonging to Larinda Ltd sank in Dartmouth recently. It's bow has enough trapped air in it that the boat is not completely submerged, but most of it is under water.
At the moment is seems to be tethered to the small tug Carly J and well secured and boomed with absorbent material, so it likely poses no risk.
This is just as well since Larinda Ltd and its associated company are very busy now with removing international garbage from cruise ships. One of their barges was moored nearby this morning waiting to unload.
This is what the boat looked like before its recent dive: