TEPCO cannot afford the world to know that their reactors are empty.
They vented the radiation of 3,000 Hiroshima bombs into the world.
So, no further insprection, no robot, no nothing.
TEPCO – 3 Reactory empty – EMPTY!: https://tekknorg.wordpress.com/2015/10/26/tepco-3-reactory-empty-empty/
Ventilating or Exploding: Each Reactor Architecture must lose Radioactive Inventory: https://tekknorg.wordpress.com/2015/04/07/ventilating-or-exploding-each-reactor-architecture-must-lose-radioactive-inventory/