TEPCO conducted the endoscopy of the Containment Vessel of Reactor 2 to see the inside. TEPCO’s spokesman Matsumoto said in the press conference that the white specs in the video is from gamma rays. White streaks across the screen are water droplets.
The endoscope is made by Olympus. Drilling the hole on the Containment Vessel was done on January 17, requiring 40 workers in 10 teams. The endoscopy operation on January 19 took 34 workers, one hour, working right next to the Containment Vessel.
For more about this operation, please see my posts,
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