Yesterday there was a post on here where Elon tweeted a reply to someone that his guess was the closest yet: https://news.ycombinator.com/item?id=6046943 https

Yesterday there was a post on here where Elon tweeted a reply to someone that his guess was the closest yet: https://news.ycombinator.com/item?id=6046943 https://news.ycombinator.com/item?id=6046943 He seems to verify that there will be "pods" 2m wide, so it sounds like this will be tunnel- or tube-based.