Well, the obvious connection, as @LoPhatt points out, is the navy. That reminds me of an article I found when looking into Washington tunnels.

I had an opportunity to spend a few hours in Washington, D.C. last week, so I checked out a TOP SECRET NAVY TUNNELING PROJECT described in the Washington Post over four years ago.

Investigation: Secret Underground Facility in Washington, D.C.. https://archive.is/aYTcd

The Washington Post in 2009 published this article in 2009 Navy Keeps A Secret in Plain Sight https://archive.is/S2lcO

Amid the secrecy, theories abound about the four-acre complex, which is dead center in a ring that includes the White House, the U.S. Capitol, the Pentagon, Reagan National Airport and the National War College. Is it a sophisticated sensor station, guarding the 14th Street bridge and other Potomac River crossings? Is it an excavation point for underwater barriers to protect the Washington Channel and Potomac River from submarines? Is it a staging area for Navy Seabees securing underwater cables between the White House and the Pentagon, across the river?

And

Del. Eleanor Holmes Norton (D-D.C.), who has criticized federal security projects for encroaching on life in the District, seldom lets slip an opportunity to make her point. In this case, however, Norton "is aware of what's going on but cannot comment," spokeswoman Doxie McCoy said.

Which leads to Eleanor Holmes Norton Open Letter To Del. Eleanor Holmes Norton, the Feds, DDOT and Congress

The crosstown I-66 link by the mid to late 1960s has been envisioned as a tunnel entirely beneath K Street for most of its length, with its western connection beneath Washington Circle and a brief stretch of Pennsylvania Avenue: a plan initially promoted by opponents of the 1955 plan such as Elizabeth Rowe.

On I-66 : I-66 North Leg West K Street Tunnel

Working more with the** L’Enfant plan** with the superior geometry of its K Street transitions with Pennsylvania and New York Avenues, ...

Apparently there are three or four bridge-tunnels in the Norfolk area: https://www.reddit.com/r/pics/comments/42dh92/bridge_that_turns_into_a_tunnel_in_virginia/?st=iwyxriwo&sh=047ad2a1

http://www.virginiadot.org/travel/hro-tunnel-default.asp

BTW: In the UK press, there are a number of articles on the topic of satanism in the navy:

http://news.bbc.co.uk/1/hi/uk/3948329.stm

http://www.forces.tv/26504822

https://www.theguardian.com/uk/2004/oct/25/military.religion

https://www.youtube.com/watch?v=Bf1CWl3KzVY