A 'private' Japanese tunnel: 1.5 km without pedaling and not a car in sight

This 1.5km tunnel is on the island of Koshiki, Kagoshima, Japan. We cycled through it at around 10pm, and we had it all to ourselves. The tunnel from start to end was a descent. This was a most surreal experience. Cycling heaven, of sorts. It was another world, a trip.
(And forgive the nasty wind sound.)
Here is the location of the tunnel.
maps.app.goo.g...

[@kschumi]

my left ear did not enjoy it. still sick ride tho

[@etownump]

@@kschumi yeah, that wind sucks.

[@faisalhussain8745]

Gives last humans on earth vibes

[@dhavidlee]

Is it downhill?

[@etownump]

Downhill the whole way. It was the best coasting ever.