Well, one thing is for sure: Cable news viewers like films about killer whales a lot more than ones about pro-nuclear power. CNN’s airing last night of the documentary Pandora’s Promise delivered a wet 345,000 total viewers in its 9-11 PM time slot and just 145,000 among adults 25-54. The heavily promoted Robert Stone-directed film was way, way down from the 1.36 million that CNN Films’ Blackfish drew in total viewers in the same slot two weeks beforehand. Promise also got less overall viewers than the film about keeping killer whales in captivity at marine theme parks pulled in just the key demo. Winning the time slot over CNN’s cable news rivals, Blackfish had 472,000 among the 25-54s when it aired October 24. CNN Films acquired the nuke-themed Pandora’s Promise in April this year after it screened at the Sundance Film Festival and had a theatrical run. Such docus as Promise and Blackfish are a part of the network’s attempt to broaden its programming scope — though with mixed results, obviously.