10/16/2011, Tepco admitted water vapor splashed (steam erupted) from underground and they measured 4.7Sv/h.
We managed to obtain further details.
Here is the location of the point.
This is how hell looks.
Infrared camera shows melted fuel is obviously out of the reactor.
Also, here it’s proved that spent fuel pool to contain MOX exploded at reactor 3.
It can be observed that the explosion happened at the spent fuel pool, blasted the wall of the south side to make a massive fire ball.
Through infrared camera, you can see scattered MOX.
MOX was set on the place, left top.
(Source)