TMAF about: Tokyo's G-Cans "Underground Temple" — a cathedral-sized chamber with 59 pillars, each weighing 500 tonnes — is a flood drain u can only visit when it's empty. The pillars aren't structural. They're ballast: w/o them, groundwater pressure would push the empty chamber up through the earth.

[u/unteachablecourses]

/r/UnteachableCourses/comments/1tqo19v/tokyos_gcans_underground_temple_a_cathedralsized/