I was reading a post comment about someone's gramps and his booklet from the 1955 nuke testing by the US (imgur gallery) and found a weird squiggle on the satellite image (screengrab), just north of the Northernmost and largest blast crater on the site (that I saw).

I would really love to know what it is - failed rocket? Unstable flight testing? Cables?

Can someone point me to some historical info on it please? Thanks in advance.