Support.  Neither of the two articles have significantly differing information except that one concentrates on the incident and the other on the drilling rig itself. Even if the available information on the incident becomes significant, it will not in and of itself justify two separate pages because the information on the rig itself is not overly comprehensive. In addition, BigTurtle's argument above makes perfect sense in that the Titanic is a much more significant disaster in terms of potential historical impact, yet there is no separate page for the ship itself.