The US will use crawling robots to inspect the ageing nuclear missile silos

Robots with the ability to climb walls will assess decades-old US missile silos that hold Minuteman IIIs, which have been an important nuclear deterrent in the US since 1970.

Source:
https://www.newscientist.com/article/2350763-crawling-robots-will-survey-ageing-us-nuclear-missile-silos/