This underground vault is located in Oppama, a former major base for the Imperial Japanese Navy Air Service, and it was said to have totaled over 2 km in length.
There are rooms large enough for a truck to fit in, rooms possibly used for storage, and other remnants of the past.

This site is a satellite spot for the Yokosuka Route Museum, a unique way to experience the entire city as a “museum” with “routes” that connects together the history, culture, and natural environment of Yokosuka.


5-2931-63 Urago-cho, Yokosuka, Kanagawa

046-822-9561 (Park Administration Div., Yokosuka City)

【Opening Hours】
9:00 - 17:00

【Regular Holidays】
New Year's Holidays (December 29 – January 3)

Guide fee varies depending on the guide

Take a bus from Oppama Station on the Keikyu Line and get off at the "Jōka Center (Purification Center)" bus stop, then walk for 5 minutes.

Natsushima Park Parking Lot Available Nearby



Return to "Yokosuka Route Museum"