A nervous stop

Shinkansen makes emergency stop in Hokkaido's subsea tunnel | The Japan Times

I see that the underground tunnel that runs between the islands of Hokkaido and Honshu has been opened for decades (since 1988), but the Shinkansen service using it is new.

I don't know:  being in a tunnel 54 km long and under the ocean in that earthquake prone part of the world - it would certainly make me nervous to undergo an emergency stop.

Update:  the Wikipedia entry on the tunnel explains that it is well below the ocean floor - about 100 m or so.   But with the massive shift in the ocean bed during that last earthquake, it may not get wet, but I really wonder if it would withstand the worst.

Also interesting to read that 34 people died in its construction.