Kawasaki Harbor Underwater Tunnel
The walkable section of this 3-meter-wide and 2180-meter-long tunnel was opened to the public in 2004, and it is Japan’s longest walkable undersea tunnel. A 15-minute walk connects Chidori Park and Higashi-ojima. The tunnel contains automatic doors that regulate its internal pressure, preventing exhaust fumes from leaking in.
Take the 川05 bus from Kawasaki Station bound for "東扇島循環" and get off at Touden-mae.