Proposal transaltion 1525

Yuzo Uehara’s proposal (tweet 1525)


(rough translation)
1525: Because lead blocks placed inside of the culvert unit, if it were extended to 250m, it would reach to the high radiation point, and there would be a small space left for workers passing through. The top part is 1m thick lead wall; and manhole, pipelines, and ventilation are installed in the center part for penetration. (cont.)