Seoul’s Seongsu Bridge 9‑cm Step Sparks Spine X‑Ray Guerrilla Ad

A roughly 9 cm rise at the south‑side ramp of Seoul’s Seongsu Bridge prompted a guerrilla public‑service campaign that hung a poster of a broken spinal X‑ray on the concrete wall, with the caption “You have to look inside to see”. The campaign, organized by Lee Jae‑seok’s advertising lab, warned that the visible step may hide deeper ground‑stability problems and called for detailed investigations using ground‑penetrating radar and borehole drilling.

Seoul city officials said the ramp has been monitored for over a decade and that recent safety inspections show the step has remained stable, but they agreed to conduct a fresh precision safety diagnosis, repair guard‑rail connections, install monitoring equipment, and make the results public. The city also announced plans to survey all Han River bridge approaches for similar issues, citing heavy rain, aging drainage, and nearby large‑scale projects such as the GTX‑A tunnel and underground road works as potential contributing factors.