Postdeadline reports of record low loss and record high-speed data transmission in hollow-core fibers at the European Conference on Optical Communications 2019 (ECOC 2019; held in Dublin, Ireland) show the growing maturity of a technology that has long been in the laboratory stage. Thomas Bradley of the University of Southampton's Optoelectronic Research Centre (Southampton, England) and colleagues measured an attenuation of 0.65 dB/km across the full C and L telecommunication bands.1 Antonio Nespola of the LINKS Foundation (Torino, Italy) and colleagues from Southampton and elsewhere transmitted digital signals through a total of 341 km of hollow-core fiber in a loop experiment, a record for hollow-core fibers.