NHK has an aerial video of Reactor 3 at Fukushima I Nuclear Power Plant, in reporting the incident of a 470-kilogram steel frame (30 centimeters x 20 centimeters x 700 centimeters) dropping into the Spent Fuel Pool on September 22.
The link probably won't last (since it's NHK), but here's a screenshot of the video that shows the sides of Reactor 3 building now have platforms on which to put heavy equipment to remove the debris.
As I mentioned in the previous post, debris removal is being done by remote-controlled equipment (in this case, a large crane) by workers in a control room; the system was devised by Kajima (see their press release from April this year:
If the crane failed to grab the steel frame and the frame dropped into the SFP, the whole sequence should have been captured by the video cameras (two on the crane arm, at least two on the platforms). I wonder if TEPCO or Kajima releases the video.