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whatonearth ago

Just to be clear, the things you're talking about are stream culverts and drainage conduits and storm sewers and things like that that you'll find in any built-up place, often full of water and not necessarily big enough for anyone to move around in. I think sometimes the readers of these threads don't realize that and think you're talking about big, dry, lighted tunnels that are somehow unique to DC.

anonymousgate ago

Here's a National Geographic segment where they show some of the tunnels being filled in Rock Creek Park. The streams seem to be more of a trickle since the installation of the tunnels, and the ones they showed could certainly fit human beings. To be clear, I'm pretty skeptical of the idea that these tunnels are being used for trafficking. That's why I wanted to either make connections or put the tunnel theory to bed. I'm still unsure whether this information is at all useful.

iamthepizzanow ago

Maybe there are drainage tunnels used as a convenient way of disposing certain types of waste to not be found. JA posted a picture of the end of a small possibly drainage tunnel in a forest, maybe Rock Creek Park.