so this paper isn't open access but its supporting information is up where you can see it without a paywall and that rules because it's a bunch of pretty nice videos of...
"Efficient collective swimming by harnessing vortices through deep reinforcement learning"
article: http://www.pnas.org/content/early/2018/05/16/1800923115
videos: http://www.pnas.org/content/suppl/2018/05/17/1800923115.DCSupplemental