Inner-shell electrons naturally sense the electric field close to the nucleus, which can reach extreme values beyond 10^(15) V cm^(-1) for the innermost electrons¹. Especially in few-electron, highly charged ions, the interaction with the electromagnetic fields can be accurately calculated within quantum electrodynamics (QED), rendering these ions good candidates to test the validity of QED in strong fields. Consequently, their Lamb shifts were intensively studied in the past …