This is the type of situation where advanced remotely controlled robots and aerial vehicles would come in handy. I guess there is no such technology that has been built and tested for this scenario.
I've wondered the same thing and have read a couple things. Robots apparently aren't nimble enough to navigate the interiors of the reactor, with all the hatches, crawlspaces, piping, ladders, etc. They also don't do well in radiation.
I did read something early this morning about the DoD using a Predator drone to get some closer aerial shots but I haven't heard anything else. It's possible that those shots are what the NRC used to conclude that the spent fuel pool at reactor 4 had run dry. Either that, or maybe one of our billion dollar spy satellites is being used.
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