The motor yacht "Go" in Saint Martin had a very bad day. Seems like from this ship tracking site, she was having control problems for a while--and they persisted until she came to a stop after slicing through fiberglass, aluminum, part of her bow--and then a concrete pier.https://www.youtube.com/watch?v=cr3O2ocn4J4
at 3:28 on the right hand side of the screen, the ship's track prior to slamming into the dock is posted. Clearly, they were having major control problems.
No current idea what the control failure was. Lucky no one got hurt.