6 DUMBs in Puerto Rico region are being hammered today. (earthquake.usgs.gov) posted 1 year ago by Tradox 1 year ago by Tradox +6 / -0 3 comments share 3 comments share save hide report block hide replies
These undergrounds are part of a worldwide tunnel and station network that extends beyond the ice ring enclosure.
Image map
https://pbs.twimg.com/media/EWliv1xWAAAHlTf?format=jpg&name=large