low tunnel
Tokyo, 2009.10.02
There's a tunnel that passes beneath the wide set of sidings near Shinagawa train station. I'd say it's about 250m wide, and nowhere near 2m tall. Here's what the entrance looks like.

And here's what I look like trying to stand in the tunnel.

My family, admiring the passing trains from a (very) close vantage point.

I don't know why this tunnel was so badly needed that they left it in there when building the tracks above, but it's a menace. The taxis that use the thing just barely pass beneath the lowest parts of the ceiling, the little globe on a taxi's roof missing that ceiling by centimeters.