Transocean Deepwater Horizon - What has been learned?

The Deepwater Horizon have inspired improvement of training for everybody involved in a drilling campaign due to commence soon in the Norwegian Sea, just short of the Arctic Circle: http://sysla.no/2017/02/28/oljeenergi/na-rigger-wintershall-seg-for-maria-oppstart_193010/
(Hope Google translate can handle this one)