U.S. Navy submarine missile launch tubes. These are for the new Columbia-class ballistic missile submarine.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...s_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net...unch_tubes.jpg
More:
https://news.usni.org/2019/04/24/ele...tart-next-year
https://en.wikipedia.org/wiki/Columbia-class_submarine
Previously:
https://www.homemadetools.net/forum/...954#post140692
https://www.homemadetools.net/forum/...011#post100498
