It was almost entirely impossible prior to that point... but there was no chance that it was a valid theory once they knew there wasn't a big hole in the bottom of the pool. There wasn't anywhere near enough time for the water to heat up... then boil off... then the fuel to overheat and melt... then pool at the bottom and reach a configuration that could support a criticality. With water in the pool, such a chain of events would take at least 7-10 days... and the explosion was just three or four days after the tsunami.
And they are just now getting a camera in there?
Nope. There have been lots of pictures (including many that you've been directed to)... it's just that they were (almost literally) clear as mud because of the debris collapsed above the racks and the concrete particles clouding the water due to the circulation from the cooling pump.
Granted, that explosion did lift a lot of nuclear material.
...
Mainly due to a lack of any other theory concerning: Just where did all that lifted nuclear material come from?
Hilarious that you're "granting" something that was never true. These images are the final nail in the coffin proving that nonsense to be misguided (at best). There was no explosion within the pool. As you've been told many times in the past, it was a hydrogen explosion above the pool which could not possible blow fuel rods out of the pool.
As you've been told many times (is there an echo in here)... there has been no evidence of solid chucks of "lifted nuclear material". There were large amounts of more volatile elements (hydrogen, iodine, cesium) that were released in venting, and large amounts (of mostly iodine/cesium as well) of materials that leaked out of the cores with cooling water (and often into the sea). These were also microscopic elements... not pieces of fuel rods blown for miles around.
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