[SECProto]

Its remained relatively hush hush, but the entrance to the tunnel (not the tunnel itself) experienced some damage from a cave in, delaying the December 10th public opening: https://www.cnet.com/news/elon-musk-pushes-back-opening-of-b...

That article mentions absolutely nothing about a cave in. I wasn't disputing the delay thing (definitely an issue with any project of Musk's), but claiming that there was a cave in requires a legitimate source.

[SECProto]

I did more research and still came up blank - I saw a number of headlines talking about "boring company caves in" - but they use it as a metaphor for them abandoning plans to extend the tunnel significantly. Not an actual cave in.