Securing Data at OSI Layer 1

An interesting article about Level3's wavelength encryption. Great marketing. Anyone know of past security breaches of any major carrier's physical transport? If not, when will it finally happen and be publicly reported? Remember to follow Trestle Networks.

http://www.channelpartnersonline.com/2017/09/19/level-3-encrypted-waves-key-to-network-security-performance/