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The page you linked also lists tunnels built for water distribution, the longest of which is the Delaware Aqueduct at 137 km.

And they are building a bypass of 2.5 miles but will take total of 8 years. All so they can fix major leaks in the current aqueduct. Fascinating project.

There's one tunnel in each direction, the video mentions the total tunnel distance as 50km.

The Channel Tunnel has three tunnels, which total ~150km then.

With the middle one being a 50km road tunnel, albeit not publicly accessible.

We've updated the headline here to clarify. Thanks!

i remember every time i went on line 3 for several stops, i thought to myself "damn, this is a long tunnel"