On the diagram on page 8/37 they show the welding of a “short pipe”, the drilling, and then the pushing of a concrete block with a stick until it falls down
TEPCO also says that in order to reduce steam (which might prevent from taking good photographs) they will increase the water injection to lower the temperature.
The yellow area on page 9/37 is the area they expect to photograph.
The violet triangles are “examples of photographs” taken with the “mock-up” performed at unit 5. CRDレール means “CRD rail”.
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